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Quantum Cryptography Explained
 
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This episode is brought to you by Squarespace: http://www.squarespace.com/physicsgirl With recent high-profile security decryption cases, encryption is more important than ever. Much of your browser usage and your smartphone data is encrypted. But what does that process actually entail? And when computers get smarter and faster due to advances in quantum physics, how will encryption keep up? http://physicsgirl.org/ ‪http://twitter.com/thephysicsgirl ‪http://facebook.com/thephysicsgirl ‪http://instagram.com/thephysicsgirl http://physicsgirl.org/ Help us translate our videos! http://www.youtube.com/timedtext_cs_panel?c=UC7DdEm33SyaTDtWYGO2CwdA&tab=2 Creator/Editor: Dianna Cowern Writer: Sophia Chen Animator: Kyle Norby Special thanks to Nathan Lysne Source: http://gva.noekeon.org/QCandSKD/QCand... http://physicsworld.com/cws/article/n... https://epic.org/crypto/export_contro... http://fas.org/irp/offdocs/eo_crypt_9... Music: APM and YouTube
Views: 276206 Physics Girl
Quantum Key Distribution: Provably Secure Encryption
 
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Hackers steal data constantly, so protecting it is an ongoing challenge. Today's information encryption technology has been compromised and will be obsolete in just a few years. Quantum Key Distribution (QKD) technology can be proven by the laws of physics to help secure the sensitive data we deliver—today and into the future.
Views: 23251 BattelleInnovations
Quantum Cryptography in 6 Minutes
 
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Quantum Cryptography explained simply. Regular encryption is breakable, but not quantum cryptography. Today we'll look at the simplest case of quantum cryptography, quantum key distribution. It uses the Heisenberg Uncertainty Principle to prevent eavesdroppers from cracking the code. Hi! I'm Jade. Subscribe to Up and Atom for new physics, math and computer science videos every week! *SUBSCRIBE TO UP AND ATOM* https://www.youtube.com/c/upandatom *Let's be friends :)* TWITTER: https://twitter.com/upndatom?lang=en *QUANTUM PLAYLIST* https://www.youtube.com/playlist?list=PL1lNrW4e0G8WmWpW846oE_m92nw3rlOpz *SOURCES* http://gva.noekeon.org/QCandSKD/QCandSKD-introduction.html https://www.sans.org/reading-room/whitepapers/vpns/quantum-encryption-means-perfect-security-986 https://science.howstuffworks.com/science-vs-myth/everyday-myths/quantum-cryptology.htm The Code Book - Simon Singh *MUSIC* Prelude No. 14 by Chris Zabriskie is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) Source: http://chriszabriskie.com/preludes/ Artist: http://chriszabriskie.com/
Views: 25391 Up and Atom
Quantum Optics – Quantum cryptography the BB84 QKD scheme
 
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One-photon based quantum technologies In this lesson, you will discover two quantum technologies based on one photon sources. Quantum technologies allow one to achieve a goal in a way qualitatively different from a classical technology aiming at the same goal. For instance, quantum cryptography is immune to progress in computers power, while many classical cryptography methods can in principle be broken when we have more powerful computers. Similarly, quantum random number generators yield true random numbers, while classical random number generators only produce pseudo-random numbers, which might be guessed by somebody else than the user. This lesson is also an opportunity to learn two important concepts in quantum information: (i) qubits based on photon polarization; (ii) the celebrated no-cloning theorem, at the root of the security of quantum cryptography. Learning Objectives • Apply your knowledge about the behavior of a single photon on a beam splitter to quantum random number generators. • Understand the no-cloning theorem • Understand and remember the properties of q qubit This course gives you access to basic tools and concepts to understand research articles and books on modern quantum optics. You will learn about quantization of light, formalism to describe quantum states of light without any classical analogue, and observables allowing one to demonstrate typical quantum properties of these states. These tools will be applied to the emblematic case of a one-photon wave packet, which behaves both as a particle and a wave. Wave-particle duality is a great quantum mystery in the words of Richard Feynman. You will be able to fully appreciate real experiments demonstrating wave-particle duality for a single photon, and applications to quantum technologies based on single photon sources, which are now commercially available. The tools presented in this course will be widely used in our second quantum optics course, which will present more advanced topics such as entanglement, interaction of quantized light with matter, squeezed light, etc... So if you have a good knowledge in basic quantum mechanics and classical electromagnetism, but always wanted to know: • how to go from classical electromagnetism to quantized radiation, • how the concept of photon emerges, • how a unified formalism is able to describe apparently contradictory behaviors observed in quantum optics labs, • how creative physicists and engineers have invented totally new technologies based on quantum properties of light, then this course is for you. Subscribe at: https://www.coursera.org
Views: 5571 intrigano
Quantum Key Distribution and the Future of Encryption
 
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By Konstantinos Karagiannis Quantum computing will bring tumultuous change to the world of information security in the coming decade. As multi-qubit systems use quantum algorithms to slice through even 4096-bit PK encryption in seconds, new Quantum Encryption will be required to ensure data security. Join Konstantinos for a look at real world experiments in Quantum Key Distribution that BT and partners have recently performed that show what the future of encryption will look like. Remember the panic after Heartbleed when SOME passwords needed to be changed? Imagine a day when ALL communications are at risk of eavesdropping via Quantum Computers - a day when only new systems that exploit the weirdness of quantum mechanics can ensure privacy.
Views: 8053 Black Hat
Quantum Key Distribution Animation
 
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Animation by Mike Brodie
Quantum cryptography, animated
 
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This animation by the Centre for Quantum Technologies at the National University of Singapore illustrates the process of quantum key distribution using entangled photons. The goal is for two people in different places to end up with identical keys by measuring these photons. We want these people - usually given the names Alice and Bob - to have a random sequence of 1s and 0s that they can use to scramble (and then unscramble) a message. The presence of entanglement between the photons means that any snooping will be revealed. Note: this animation has no sound. See also our video series on cryptography: https://www.youtube.com/playlist?list=PL4CHL5j4XhurVKJz16Qg6qj0toMHyLh7q
Quantum Key Distribution - Norbert Lütkenhaus - USEQIP 2011
 
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A full lecture about Quantum Key Distribution by Prof. Norbert Lutkenhaus during the Undergraduate School on Experimental Quantum Information Processing (USEQIP) at the Institute for Quantum Computing. For more: iqc.uwaterloo.ca www.facebook.com/QuantumIQC Twitter: @QuantumIQC
Secret Key Exchange (Diffie-Hellman) - Computerphile
 
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How do we exchange a secret key in the clear? Spoiler: We don't - Dr Mike Pound shows us exactly what happens. Mathematics bit: https://youtu.be/Yjrfm_oRO0w Computing Limit: https://youtu.be/jv2H9fp9dT8 https://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: https://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 231516 Computerphile
Quantum Cryptography In Space
 
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I've had a lot of requests to cover the recent announcement that a Chinese research team has successfully delivered entangle photon pairs to locations separated 1000km. The press and speculation has been a little misleading so here's my explanation of how this works and what it means. This video is my second attempt - here' my original voiceover without graphics for those who are curious. https://www.youtube.com/watch?v=CfInxdjWRZA
Views: 48072 Scott Manley
Quantum Key Distribution security
 
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http://spirent.com Presentation on how to use Quantum Key Distribution (QKD) to set up a secrete key between two parties. Also a quick overview of the protocol BB84. Sometimes known as Quantum cryptography.
Views: 7925 alantalkstech
IEEE 2014 Full security of quantum key distribution from no signaling constraints
 
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Full security of quantum key distribution from no-signaling constraints
Views: 60 WingzTechnolo gies
CCS 2016 - Frodo: Take off the ring! Practical, Quantum-Secure Key Exchange from LWE
 
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Authors: Joppe Bos (NXP Semiconductors), Craig Costello (Microsoft Research), Léo Ducas (CWI), Ilya Mironov (Google), Michael Naehrig (Microsoft Research), Valeria Nikolaenko (Stanford University), Ananth Raghunathan (Google) and Douglas Stebila (McMaster University) presented at CCS 2016 - the 23rd ACM Conference on Computer and Communications Security (Hofburg Palace Vienna, Austria / October 24-28, 2016) - organized by SBA Research
Views: 633 CCS 2016
Quantum Key Distribution: State of the Art Technology and Real-life Applications, Kelly Richdale
 
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Quantum Key Distribution: State of the Art Technology and Real-life Applications, Kelly Richdale, MBA & CISSP (ID Quantique) Initiated in 2015, the Centre for Quantum Engineering (CQE) is a thematic research centre in the field of quantum engineering at Aalto University. 22.04.2015 The official launching event of the new centre at Aalto enlightens the goals of the initiative and presents the first activities to realize them. Video by Aalto University Communications / Mikko Raskinen 2015
Views: 1379 Aalto University
QCrypt2017 Mo11 Practical post quantum key exchange
 
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Douglas Stebila , "Practical post-quantum key exchange", QCrypt2017, Mo11 18-22 Sept 2017, Cambridge UK
Views: 268 QCrypt2017
Network Security - One Time Pad & Quantum Key Distribution
 
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Fundamentals of Computer Network Security This specialization in intended for IT professionals, computer programmers, managers, IT security professionals who like to move up ladder, who are seeking to develop network system security skills. Through four courses, we will cover the Design and Analyze Secure Networked Systems, Develop Secure Programs with Basic Cryptography and Crypto API, Hacking and Patching Web Applications, Perform Penetration Testing, and Secure Networked Systems with Firewall and IDS, which will prepare you to perform tasks as Cyber Security Engineer, IT Security Analyst, and Cyber Security Analyst. course 2 Basic Cryptography and Programming with Crypto API: About this course: In this MOOC, we will learn the basic concepts and principles of cryptography, apply basic cryptoanalysis to decrypt messages encrypted with mono-alphabetic substitution cipher, and discuss the strongest encryption technique of the one-time-pad and related quantum key distribution systems. We will also learn the efficient symmetric key cryptography algorithms for encrypting data, discuss the DES and AES standards, study the criteria for selecting AES standard, present the block cipher operating modes and discuss how they can prevent and detect the block swapping attacks, and examine how to defend against replay attacks. We will learn the Diffie-Hellman Symmetric Key Exchange Protocol to generate a symmetric key for two parties to communicate over insecure channel. We will learn the modular arithmetic and the Euler Totient Theorem to appreciate the RSA Asymmetric Crypto Algorithm, and use OpenSSL utility to realize the basic operations of RSA Crypto Algorithm. Armed with these knowledge, we learn how to use PHP Crypto API to write secure programs for encrypting and decrypting documents and for signing and verify documents. We then apply these techniques to enhance the registration process of a web site which ensures the account created is actually requested by the owner of the email account. Module 1 - Basic Cryptography In this module we learn the basic concepts and principles of crytography, introduce the basic concept of cryptoanalysis using mono-alphabetic substitution cipher as an example, and discuss the one-time-pad and quantum key distribution concepts. Learning Objectives • Compose secure program with Crypto API for encryption, authentication, and integrity checking • Understand terminologies of basic cryptography • Understand Kerchhoff Principle • Apply cryptoanalysis techniques on mono-alphabetic ciphers • Explain why one time pad is strongest and understand how quantum key can be distributed
Views: 441 intrigano
Quantum Key Distribution - Dr Anindita Banerjee, QuNu Labs Pvt Ltd
 
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Dr Anindita Banerjee, Quantum Security Specialist at QuNu Labs Pvt Ltd speaks on basics of Quantum Key Distribution and the processes involved.
Will Quantum Computers break encryption?
 
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How do you secure messages over the internet? How do quantum computers break it? How do you fix it? Why don't you watch the video to find out? Why does this description have so many questions? Why are you still reading? What is the meaning of life? Facebook: https://www.facebook.com/frameofessence Twitter: https://twitter.com/frameofessence YouTube: https://www.youtube.com/user/frameofessence CLARIFICATIONS: You don't actually need a quantum computer to do quantum-safe encryption. As briefly mentioned at 7:04 , there are encryption schemes that can be run on regular computers that can't be broken by quantum computers. CORRECTIONS: [2:18] Technically, you can use any key to encrypt or decrypt whatever you want. But there's a specific way to use them that's useful, which is what's shown in the video. [5:36] In RSA, depending on exactly what you mean by "private key", neither key is actually derivable from the other. When they are created, they are generated together from a common base (not just the public key from the private key). But typically, the file that stores the "private key" actually contains a bit more information than just the private key. For example, in PKCS #1 RSA private key format ( https://tools.ietf.org/html/rfc3447#appendix-A.1.2 ), the file technically contains the entire public key too. So in short, you technically can't get the public key from the private key or vice versa, but the file that contains the private key can hold more than just the private key alone, making it possible to retrieve the public key from it. Video links: Encryption and HUGE numbers - Numberphile https://youtu.be/M7kEpw1tn50 The No Cloning Theorem - minutephysics https://youtu.be/owPC60Ue0BE Quantum Entanglement & Spooky Action at a Distance - Veritasium https://youtu.be/ZuvK-od647c Sources: Quantum Computing for Computer Scientists http://books.google.ca/books/about/Quantum_Computing_for_Computer_Scientist.html?id=eTT0FsHA5DAC Random person talking about Quantum MITM attacks http://crypto.stackexchange.com/questions/2719/is-quantum-key-distribution-safe-against-mitm-attacks-too The Ekert Protocol (i.e. E91) http://www.ux1.eiu.edu/~nilic/Nina's-article.pdf Annealing vs. Universal Quantum Computers https://medium.com/quantum-bits/what-s-the-difference-between-quantum-annealing-and-universal-gate-quantum-computers-c5e5099175a1 Images, Documents, and Screenshots: Post-Quantum Cryptography initiatives http://csrc.nist.gov/groups/ST/post-quantum-crypto/cfp-announce-dec2016.html http://pqcrypto.eu.org/docs/initial-recommendations.pdf Internet map (Carna Botnet) http://census2012.sourceforge.net/ Quantum network maps https://www.slideshare.net/ADVAOpticalNetworking/how-to-quantumsecure-optical-networks http://www.secoqc.net/html/press/pressmedia.html IBM Quantum http://research.ibm.com/ibm-q/ Music: YouTube audio library: Blue Skies Incompetech: Jay Jay Pamgaea The House of Leaves Premium Beat: Cutting Edge Technology Second Time Around Swoosh 1 sound effect came from here: http://soundbible.com/682-Swoosh-1.html ...and is under this license: https://creativecommons.org/licenses/sampling+/1.0/
Views: 740157 Frame of Essence
Quantum Key Distribution | QuTech Academy
 
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Video: Quantum Key Distribution Do you want to learn more about the building blocks of a Quantum Computer? View the complete course at: https://www.edx.org/course/the-building-blocks-of-a-quantum-computer-part-2 More courses at http://qutech.nl/edu/
Views: 89 QuTech Academy
the Quantum Key by Aaron Murakami
 
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Under Fair Use Act Copyrighted material from Aaron Murakami & Energy Science Conference (2016) http://enjoypolo.qiman.hop.clickbank.net This is the companion video of the book Quantum Key, written by Aaron Murakami. Presenting and describing in details of the brand new branch of Sciences unveiling the quantum working of forces. I recommend all those interested in this material (and if you are here, there is a reason) to check the book. At less than $30, this is the Science book that explains in details topics such as: Aether model; Potential & Energy; Dipoles; Mass & Gravity and whole lot more, including Bedini SG machine. If you're interested or have questions, send me a message/comment below. “Let the future tell the truth, and evaluate each one according to his work and accomplishments. The present is theirs; the future, for which I have really worked, is mine” Nikola Tesla
Views: 2029 enjoypolo
How to establish an encryption key securely with the Quantum Key Distribution scheme ?
 
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BB84 protocol is a quantum key distribution scheme developed by Charles Bennett and Gilles Brassard in 1984. It is the first quantum cryptography protocol. The protocol is provably secure, relying on the quantum property that information gain is only possible at the expense of disturbing the signal if the two states one is trying to distinguish are not orthogonal. It is a method of securely communicating a private key from one party to another for use in one-time pad encryption. So how to establish a random encryption key securely with the Quantum Key Distribution scheme ? Alice creates a random bit of 0 or 1 and then randomly selects one of her two bases (rectilinear or diagonal) to transmit it in. She then prepares a photon polarization state depending both on the bit value and basis. So for example a 0 is encoded in the rectilinear basis (+) as a vertical polarization state, and a 1 is encoded in the diagonal basis (x) as a 135° state. Alice then transmits a single photon in the state specified to Bob, using a quantum channel. This process is then repeated from the random bit stage, with Alice recording the state, basis and time of each photon sent. As Bob does not know the basis the photons were encoded in, all he can do is to select a basis at random to measure in, either rectilinear or diagonal. He does this for each photon he receives, recording the time, measurement basis used and measurement result. After Bob has measured all the photons, he communicates with Alice over the public classical channel. Alice broadcasts the basis each photon was sent in, and Bob the basis each was measured in. They both discard photon measurements (bits) where Bob used a different basis, which is half on average, leaving half the bits as a shared key. Quantum key distribution is only used to produce and distribute a key, not to transmit any message data. This key can then be used with the one-time pad cipher with a secret random key. This video was downloaded and edited from Quantum cryptography, animated by Centre for Quantum Technologies @ https://www.youtube.com/watch?v=LaLzshIosDk
Views: 1046 satnamo
Introduction to quantum cryptography - Vadim Makarov
 
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I introduce the basic principles of quantum cryptography, and discuss today's status of its technology, with examples of optical schemes and components. No prior knowledge of quantum mechanics is required :). This first lecture is about the basics of quantum cryptography. Lectures 2 and 3 cover quantum hacking: https://www.youtube.com/watch?v=2r7B8Zpxmcw https://www.youtube.com/watch?v=Sc_cJiLFQZ0 Presentation slides of the entire lecture course can be downloaded at: Power Point (95 MiB, with videos and animations) - http://www.vad1.com/lab/presentations/Makarov-20140801-IQC-short-course.pptx PDF (14.8 MiB, static images only) - http://www.vad1.com/lab/presentations/Makarov-20140801-IQC-short-course.pdf Vadim Makarov is a research assistant professor at the Institute for Quantum Computing, heading the Quantum hacking lab - http://www.vad1.com/lab/ This course was part of a lecture series hosted by CryptoWorks21 in August 2014 in Waterloo, Canada. Find out more about IQC! Website - https://uwaterloo.ca/institute-for-quantum-computing/ Facebook - https://www.facebook.com/QuantumIQC Twitter - https://twitter.com/QuantumIQC
Practical Quantum Cryptography and Possible Attacks
 
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Google Tech Talks January, 24 2008 ABSTRACT Quantum cryptography is actually about secure distribution of an encryption key between two parties. In this talk I give an introduction to practical quantum cryptography. I will describe the technical details of a few implementations, how the security of the distributed key might be compromised, and what steps can be taken to prevent this. Speaker: Alexander Ling Alexander Ling is a graduate student with the Experimental Quantum Optics group in the Center for Quantum Technologies in Singapore. He has spent the last four years building sources of high-quality polarization-entangled photon-pairs. The entangled light is then used for various things like testing the validity of quantum mechanics and quantum key distribution. He hopes to complete his Ph.D. in 4 months.
Views: 17367 GoogleTechTalks
Labcast #4: Quantum Key Distribution
 
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Toshiba is one of the world leaders in Quantum Cryptography and has been able to demonstrate the highest sustained bit rate for secure data communications. Toshibas new technique has sustained data rates of over 1megabit/sec, allowing for the first time the secure transmission of larger files such as audio and video. This episode contains an introduction to Toshibas research into Quantum Key Distribution and Quantum Cryptography. Dr Andrew Shields from the Toshiba Cambridge Research Lab, give's an introduction to the world of codes and ciphers by visiting historic Bletchley Park to look at codes of the past such as the Enigma and Lorentz Codes. The video also introduces Toshibas research in the field, with a demonstration of Quantum Encryption.
Views: 3206 leadinginnovation
Post-Quantum Key Exchange for the TLS Protocol from the Ring Learning with Errors Problem
 
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Post-Quantum Key Exchange for the TLS Protocol from the Ring Learning with Errors Problem Douglas Stebila Presented at the 2015 IEEE Symposium on Security & Privacy May 18--20, 2015 San Jose, CA http://www.ieee-security.org/TC/SP2015/ ABSTRACT Lattice-based cryptographic primitives are believed to offer resilience against attacks by quantum computers. We demonstrate the practicality of post-quantum key exchange by constructing cipher suites for the Transport Layer Security (TLS) protocol that provide key exchange based on the ring learning with errors (R-LWE) problem, we accompany these cipher suites with a rigorous proof of security. Our approach ties lattice-based key exchange together with traditional authentication using RSA or elliptic curve digital signatures: the post-quantum key exchange provides forward secrecy against future quantum attackers, while authentication can be provided using RSA keys that are issued by today's commercial certificate authorities, smoothing the path to adoption. Our cryptographically secure implementation, aimed at the 128-bit security level, reveals that the performance price when switching from non-quantum-safe key exchange is not too high. With our R-LWE cipher suites integrated into the Open SSL library and using the Apache web server on a 2-core desktop computer, we could serve 506 RLWE-ECDSA-AES128-GCM-SHA256 HTTPS connections per second for a 10 KiB payload. Compared to elliptic curve Diffie-Hellman, this means an 8 KiB increased handshake size and a reduction in throughput of only 21%. This demonstrates that provably secure post-quantum key-exchange can already be considered practical.
Quantum Key Distribution in ICS
 
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Quantum Key Distribution (QKD) is based on physics rather than classic information theory. You get a quick, easily understood lesson on entangled photons, happy and sad photons that are truly random, not pseudo-random. The photons can be "random and correlated over a great distance". It's not just theory; it's being tested at SDG&E. Duncan Earl discusses the theory of QKD, and then Adam Crain talks about how this can be used for key distribution in an ICS protocol, using SSP-21 as an example.
Views: 223 S4 Events
Introduction to Quantum Cryptography and the Tokyo QKD Network
 
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Quantum cryptography、consisting of quantum key distribution (QKD) and one-time pad encryption, allows for communication with unconditional security. In QKD systems, the senders encode information on single photons one by one, while the receivers measure the photon states and decode the information. By distilling possible eavesdropped bits, secure keys can be shared between the senders and receivers. Tokyo QKD Network, into which various quantum key distribution systems were integrated through cross platform, established upon NICT's test bed ("JGN2plus"). We have succeeded in the key-relay and the rerouting experiment using Tokyo QKD Network.
Views: 12685 NICTchannel
What is QUANTUM KEY DISTRIBUTION? What does QUANTUM KEY DISTRIBUTION mean?
 
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What is QUANTUM KEY DISTRIBUTION? What does QUANTUM KEY DISTRIBUTION mean? QUANTUM KEY DISTRIBUTION meaning - QUANTUM KEY DISTRIBUTION definition - QUANTUM KEY DISTRIBUTION explanation. Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license. SUBSCRIBE to our Google Earth flights channel - https://www.youtube.com/channel/UC6UuCPh7GrXznZi0Hz2YQnQ Quantum key distribution (QKD) uses quantum mechanics to guarantee secure communication. It enables two parties to produce a shared random secret key known only to them, which can then be used to encrypt and decrypt messages. It is often incorrectly called quantum cryptography, as it is the best-known example of a quantum cryptographic task. An important and unique property of quantum key distribution is the ability of the two communicating users to detect the presence of any third party trying to gain knowledge of the key. This results from a fundamental aspect of quantum mechanics: the process of measuring a quantum system in general disturbs the system. A third party trying to eavesdrop on the key must in some way measure it, thus introducing detectable anomalies. By using quantum superpositions or quantum entanglement and transmitting information in quantum states, a communication system can be implemented that detects eavesdropping. If the level of eavesdropping is below a certain threshold, a key can be produced that is guaranteed to be secure (i.e. the eavesdropper has no information about it), otherwise no secure key is possible and communication is aborted. The security of encryption that uses quantum key distribution relies on the foundations of quantum mechanics, in contrast to traditional public key cryptography, which relies on the computational difficulty of certain mathematical functions, and cannot provide any mathematical proof as to the actual complexity of reversing the one-way functions used. QKD has provable security based on information theory, and forward secrecy. Quantum key distribution is only used to produce and distribute a key, not to transmit any message data. This key can then be used with any chosen encryption algorithm to encrypt (and decrypt) a message, which can then be transmitted over a standard communication channel. The algorithm most commonly associated with QKD is the one-time pad, as it is provably secure when used with a secret, random key. In real-world situations, it is often also used with encryption using symmetric key algorithms like the Advanced Encryption Standard algorithm.
Views: 280 The Audiopedia
Advances in quantum cryptography for free-space communications
 
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Quantum mechanics provides methods of encryption that are secure from eavesdropping attacks against the quantum channel. The National Institute of Standards and Technology (NIST; Gaithersburg, MD) has developed a high-speed quantum key distribution test bed incorporating both free-space and fiber systems. In this video, Joshua Bienfang of NIST talks about the quantum cryptographic system that operates over a 1.5-kilometer free-space link on the NIST campus. These quantum communication systems rely on cryptographic key known to both the sender (Alice) and receiver (Bob). Transmitting at 1.25 gigahertz, any intrusion into the system would be detected by comparing data at the transmitting and receiving end. Bienfang is a physicist in the Electron and Optical Physics Division at NIST, where he works on quantum cryptography. Related publications: Quantum key distribution at GHz transmission rates Alessandro Restelli, Joshua C. Bienfang, Alan Mink, and Charles W. Clark Proceedings of SPIE Volume 7236 (2009) High speed quantum key distribution system supports one-time pad encryption of real-time video Alan Mink, Xiao Tang, LiJun Ma, Tassos Nakassis, Barry Hershman, Joshua C. Bienfang, David Su, Ron Boisvert, Charles W. Clark, and Carl J. Williams Proceedings of SPIE Volume 6244 (2006)
Views: 3979 SPIETV
Taking quantum key distribution out of the lab
 
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Members of the Quantum Photonics Lab, led by Institute for Quantum Computing (IQC) researcher Thomas Jennewein, designed and constructed a working portable demonstration of Quantum Key Distribution (QKD). The QKD demo used hardware components designed by Excelitas Technologies, an industry partner who provides customized optoelectronics and advanced electronic systems. QKD enables secure communication between two parties. QKD establishes highly secure keys between distant parties by using single photons to transmit each bit of the key. Since single photons behave according the laws of quantum mechanics they cannot be tapped, copied or directly measured without detection. The huge benefit for users of such systems is the peace of mind of knowing that any attack, manipulation or copying of the photons can be immediately detected and overcome. QKD solves the long-standing problem of securely transporting cryptographic keys between distant locations. Even if they were to be transmitted across hostile territory, their integrity could be unambiguously verified upon receipt. ________________________________________________________________________________________________ La distribution quantique de clés dans le monde réel Des membres du Laboratoire de photonique quantique, sous la direction de Thomas Jennewein, chercheur à l’Institut d’informatique quantique (IQC), ont conçu et réalisé une démonstration portable de distribution quantique de clés (DQC). L’appareil de démonstration faisait appel à des composantes conçues par Excelitas Technologies, partenaire industriel qui fournit des systèmes personnalisés d’optoélectronique et d’électronique avancée. La DQC permet à deux parties de communiquer en toute sécurité. Elle établit des clés très sûres entre des parties éloignées l’une de l’autre en utilisant des photons individuels pour transmettre chaque bit de ces clés. Comme des photons individuels se comportent selon les lois de la mécanique quantique, ils ne peuvent être interceptés, copiés ou directement mesurés sans que cela ne soit détecté. Le grand avantage de tels systèmes pour les utilisateurs est la tranquillité d’esprit que procure le fait de savoir que toute attaque, manipulation ou copie des photons peut être immédiatement détectée et contrée. La DQC résout le problème classique de la transmission sécuritaire de clés cryptographiques sur de grandes distances. Même si elles doivent traverser un territoire hostile, leur intégrité peut être vérifiée avec certitude au moment de leur réception.
Quantum Cryptography | CaltechX and DelftX on edX | Course About Video
 
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Learn how quantum communication provides security that is guaranteed by the laws of nature. Take this course free on edX: https://www.edx.org/course/quantum-cryptography-caltechx-delftx-qucryptox#! ABOUT THIS COURSE How can you tell a secret when everyone is able to listen in? In this course, you will learn how to use quantum effects, such as quantum entanglement and uncertainty, to implement cryptographic tasks with levels of security that are impossible to achieve classically. This interdisciplinary course is an introduction to the exciting field of quantum cryptography, developed in collaboration between QuTech at Delft University of Technology and the California Institute of Technology. By the end of the course you will: - Be armed with a fundamental toolbox for understanding, designing and analyzing quantum protocols. - Understand quantum key distribution protocols. - Understand how untrusted quantum devices can be tested. - Be familiar with modern quantum cryptography – beyond quantum key distribution. This course assumes a solid knowledge of linear algebra and probability at the level of an advanced undergraduate. Basic knowledge of elementary quantum information (qubits and simple measurements) is also assumed, but if you are completely new to quantum information additional videos are provided for you to fill in any gaps. WHAT YOU'LL LEARN - Fundamental ideas of quantum cryptography - Cryptographic concepts and tools: security definitions, the min-entropy, privacy amplification - Protocols and proofs of security for quantum key distribution - The basics of device-independent quantum cryptography - Modern quantum cryptographic tasks and protocols
Views: 9826 edX
Experimental quantum key distribution without monitoring signal disturbance
 
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http://dx.doi.org/10.1038/nphoton.2015.173 Takesue et al. "Experimental quantum key distribution without monitoring signal disturbance." Nature Photonics (2015). doi: 10.1038/nphoton.2015.173 Video produced by Research Square: https://www.researchsquare.com/videos
Views: 1230 Research Square
Christian Schaffner: Quantum Cryptography
 
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I will entertain the audience with a science talk about quantum cryptography, covering both some classics (Quantum Key Distribution) and the latest developments (position-based quantum cryptography) in this fascinating research field. [No previous knowledge of quantum mechanics is required to follow the talk.] Christian Schaffner
Views: 1595 media.ccc.de
Post-quantum cryptography from supersingular isogeny problems?
 
01:03:44
We review existing cryptographic schemes based on the hardness of computing isogenies between supersingular isogenies, and present some attacks against them. In particular, we present new techniques to accelerate the resolution of isogeny problems when the action of the isogeny on a large torsion subgroup is known, and we discuss the impact of these techniques on the supersingular key exchange protocol of Jao-de Feo.  See more on this video at https://www.microsoft.com/en-us/research/video/post-quantum-cryptography-supersingular-isogeny-problems/
Views: 1069 Microsoft Research
Quantum Key Distribution Implementation
 
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Implementation of Quantum Key Distribution (QKD) using short polarized pulses of light. Research project done in the School of Computer Science, Carleton University, Ottawa, Canada.
Views: 325 SpecialDuJour2008
Quantum Key Distribution: A Conceptual Primer for Online Privacy Enthusiasts
 
10:13
Entanglement and Destructive Reading are two well established quantum principles allowing two online strangers to talk, and transact in total privacy. Unlike the common asymmetric cryptography, quantum privacy is guaranteed by the laws of nature, which unlike the laws of some governments will not be violated by unscrupulous power holders. You owe it to yourself to understand how technology can restore our long lost privacy.
Views: 570 Gideon Samid
Introduction to the Post-Quantum Supersingular Isogeny Diffie-Hellman Protocol
 
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A talk given at the University of Waterloo on July 12th, 2016. The intended audience was mathematics students without necessarily any prior background in cryptography or elliptic curves. Apologies for the poor audio quality. Use subtitles if you can't hear.
Views: 2307 David Urbanik
UQCC 2015 commentary video in "Quantum Key Distribution"
 
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Embedded video commentary of QKD mechanism in presentation performed by NICT along with the session "Quantum Key Distribution (QKD)" in part II Fiber Network, UQCC 2015.
Quantum Key Distribution (2010) Short version
 
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Introductory video of Quantum Key Distribution (2010) 9 minutes
[EN] Side-channel Attack of a Quantum Key Distribution System, Martina Bodini
 
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We are never so vulnerable than when we feel safe. Quantum key distribution systems are the first place to go if looking for best state-of-art secure transmission. They rely on an intrinsic principle, a system cannot be measured without perturbing it so, in theory, quantum encryption keys cannot be intercepted without being noticed. But an algorithm is known to be resistant until it fails, even theoretically perfect setups can be hacked: blinding a receiver is only a way to crack a quantum key, yet leaving no trace. Unconditional secure transmissions could be bypassed by simply acting on the boundary. Strong quantum physics skills are not needful for delving further into these points, it is important to have knowledge of how quantum computers work, and how they differ from traditional machines: during the talk, an initial overview will provide all the necessary keys to go deeper, from the concept of quantum entanglement, without which quantum computers would not exist, to implications that far outpace conventional approaches to computing. Working in the Quantum Optics field brought me in close contact with some physical limitations, rather than particular technological weaknesses. A practical quantum key distribution system consists of a transmitter and a series of detectors: in an ideal world the detectors are identical, but in practice manufacturing devices with the same features is literally impossible. As a consequence, for the same quantum key distribution system there are detectors working with different detection efficiencies depending on frequency, polarisation and spatial domain (case 1: detection efficiency of the bits “0” and “1” are unbalanced; case 2: two or more detectors of the same system responds differently when working under identical conditions). A lack of accuracy emerges from the low detection efficiency caused by detectors mismatch, giving an eavesdropper a powerful handle to gain useful information on the key without being noticed. We will see how this implicate a non-negligible probability to break the security of “unconditionally unbreakable” networks: an experimental demonstration of an outstanding side channel attack against a commercial quantum key distribution system conducted by third parties will be discussed.
Views: 210 Asso HZV
Masahide Sasaki - Quantum Key Distribution Platform and Its Applications
 
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Title: Quantum Key Distribution Platform and Its Applications Speaker: Masahide Sasaki 7th International Conference on Post-Quantum Cryptography PQCrypto 2016 https://pqcrypto2016.jp/program/
Views: 177 PQCrypto 2016
Vladyslav Usenko - Proof-of-principle test of continuous-variable quantum key distribution in...
 
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Contributed Talk 13 by Vladyslav Usenko at 5th International Conference on Quantum Cryptography (QCrypt 2015) in Hitotsubashi Hall, Tokyo, September 30th, 2015. Title: "Proof-of-principle test of continuous-variable quantum key distribution in free-space atmospheric channel." Download the slides at: http://2015.qcrypt.net/scientific-program/
Views: 277 QCrypt 2015
35C3 -  The year in post-quantum crypto
 
01:10:01
https://media.ccc.de/v/35c3-9926-the_year_in_post-quantum_crypto The world is finally catching on to the urgency of deploying post-quantum cryptography: cryptography designed to survive attacks by quantum computers. NIST's post-quantum competition is in full swing, and network protocols are exploring post-quantum extensions. This talk will take the audience on a journey through selected recent highlights from the post-quantum world. Post-quantum cryptography has become one of the most active areas in cryptography, trying to address important questions from potential users. Is post-quantum cryptography secure? In the first ten months of this year we have seen several serious breaks of submissions to the NIST competition. At this point, out of the original 69 submissions, 13 are broken and 8 are partially broken. Are the remaining 48 submissions all secure? Or is this competition a denial-of-service attack against the cryptanalysis community? NIST will select fewer candidates for the 2nd round, but it is not clear whether there is an adequate basis for judging security. Does post-quantum cryptography provide the functionality we expect from cryptography? For example, the original Diffie-Hellman system provides not just encryption but also more advanced features such as non-interactive key exchange (not provided by any NIST submissions) and blinding. The era of post-NIST post-quantum cryptography has begun with the exciting new CSIDH proposal, which has non-interactive key exchange and is smaller than any NIST submission, but uses more CPU time and needs much more study. Is post-quantum cryptography small enough? Even for network protocols that rely purely on encryption, integration remains a major problem because of the bandwidth requirements of most post-quantum systems, especially the post-quantum systems with the strongest security track records. Experiments with integration of post-quantum cryptography into TLS have focused on encryption without post-quantum authentication. A new generation of network protocols has been designed from the ground up for full post-quantum security. Is post-quantum cryptographic software fast enough, and is it safe to use? Adding post-quantum cryptography to the cryptographic software ecosystem has produced a giant step backwards in software quality. Major areas of current activity include software speedups, benchmarking, bug fixes, formal verification, patent avoidance, and development of post-quantum software libraries such as Open Quantum Safe and libpqcrypto. The talk will be given as a joint presentation by Daniel J. Bernstein and Tanja Lange. djb Tanja Lange https://fahrplan.events.ccc.de/congress/2018/Fahrplan/events/9926.html
Views: 3609 media.ccc.de
Interview Shaheer Niazi at National Science Fair " Quantum key distribution"
 
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17 year old, Shaheer Niazi, is the youngest Pakistani scientist in the world who has won local & international recognition for his work in Physics with the "electric honeycomb"! Pakistan Science club interviewed @M_shaheer_Niazi two year back on the occasion of national science fair 15-16 at Lahore his project was Quantum key distribution
Views: 1368 Pak Science Club
Christopher Pugh explains his research in quantum key distribution
 
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PhD student Christopher Pugh researches free space propagation of quantum information signals over long distances for the purpose of secure quantum communication, specifically quantum key distribution (QKD). QKD uses the laws of quantum mechanics to establish a shared key that is secure and independent of any other data, provided the two parties also share a classical authenticated channel. The potential to share quantum keys globally opens up with a satellite network where quantum keys can be distributed from ground stations located around the world to satellite stations and back.

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