Search results “Quantum key exchange”

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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?
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Source:
http://gva.noekeon.org/QCandSKD/QCand...
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https://epic.org/crypto/export_contro...
http://fas.org/irp/offdocs/eo_crypt_9...
Music: APM and YouTube

Views: 276206
Physics Girl

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 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.
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https://www.sans.org/reading-room/whitepapers/vpns/quantum-encryption-means-perfect-security-986
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Views: 25391
Up and Atom

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

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

Animation by Mike Brodie

Views: 17264
Institute for Quantum Computing

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

Views: 27900
Centre for Quantum Technologies

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

Views: 3338
Institute for Quantum Computing

Views: 359
uclaphysicsvideo

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

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

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

Full security of quantum key distribution from no-signaling constraints

Views: 60
WingzTechnolo gies

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, 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

Views: 1719
uclaphysicsvideo

Douglas Stebila , "Practical post-quantum key exchange", QCrypt2017, Mo11 18-22 Sept 2017, Cambridge UK

Views: 268
QCrypt2017

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

Dr Anindita Banerjee, Quantum Security Specialist at QuNu Labs Pvt Ltd speaks on basics of Quantum Key Distribution and the processes involved.

Views: 1472
QuNu Labs Pvt Ltd, Bengaluru, India

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
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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

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

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

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

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

Views: 16633
Institute for Quantum Computing

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

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
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.

Views: 1282
IEEE Symposium on Security and Privacy

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

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? 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.
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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

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

Views: 233
uclaphysicsvideo

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.

Views: 556
Institute for Quantum Computing

Views: 168
Campus Party

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

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

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

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

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

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

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

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.

Views: 226
Quantum ICT Laboratory, NICT JAPAN

Views: 319
uclaphysicsvideo

Introductory video of Quantum Key Distribution (2010) 9 minutes

Views: 1131
Quantum ICT Laboratory, NICT JAPAN

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

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

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

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

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

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.

Views: 306
Institute for Quantum Computing

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