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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Views: 283236
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: 24111
BattelleInnovations

Animation by Mike Brodie

Views: 17780
Institute for Quantum Computing

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: 6381
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: 8281
Black Hat

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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Views: 28907
Up and Atom

A short video attempting to explain the Bennett & Brassard quantum cryptography protocol.
I've omitted any mention of the particular details of quantum physics that would be involved in actual real-world implementations, such as particle polarization axes, spin, and so forth, instead replacing them with abstract "processes" and freakish mysterious "machines". The physical details (interesting though they are) are not needed to understand the basics of the protocol, and I'm no physicist, so I'd probably mess them up if I tried (assuming I haven't already!).
Making these images has increased my affection for Microsoft PowerPoint, and putting them all into a video has hugely exacerbated my hatred for Windows Movie Maker.
NOTE:
An important missing piece of information: When Alice sends qubits to Bob, she chooses between process A and process B randomly for each qubit.
NOTE 2:
The following video explains BB84 as well, and gives more detail regarding the physics details:
http://www.youtube.com/watch?v=7SMcf1MdOaQ
NOTE 3:
Here is another very interesting video about quantum cryptography. Any given real-world implementation, despite using the BB84 protocol, is bound to expose weaknesses that can be exploited. For example:
http://www.youtube.com/watch?v=T0WnUlF2eAo

Views: 47690
Creature Mann

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: 10144
edX

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: 160
QuTech Academy

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: 1237
satnamo

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: 29388
Centre for Quantum Technologies

Speaker: Mr. Neil McRae (BT)
http://uknof.uk/41/
This presentation highlights some research carried out in BT that shows the possibility of securing communications using QKD. In a world where quantum compute will soon make normal security and encryption techniques ineffective finding new ways of ensuring data security are required.

Views: 112
UKNOFconf

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: 3414
Institute for Quantum Computing

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

Views: 1574
QuNu Labs Pvt Ltd, Bengaluru, India

Video: Quantum key distribution
Do you want to learn more about Quantum Computers and the Quantum Internet? Find out what QuTech Academy has to offer at: http://qutech.nl/edu/

Views: 70
QuTech Academy

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: 1334
IEEE Symposium on Security and Privacy

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: 8040
alantalkstech

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Quantum computing is cool, but you know what would be extra awesome - a quantum internet. In fact if we want the first we’ll need the latter. And the first step to the quantum internet is quantum cryptography.
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#cryptography #quantumcomputing #spacetime
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Written by Graeme Gossel and Matt O'Dowd
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Quantum theory may seem like an obscure subject of questionable relevance to the average person. But in fact much of our technological world depends on our understanding of the quantum properties of the subatomic universe. And soon, perhaps very soon, we’ll be interacting with the weirdness of quantum mechanics even more directly – with the coming of quantum computing and the quantum internet. Quantum computing is a topic that’s that has been well covered, so we’re going to be talking about the quantum internet. Specifically quantum cryptography and quantum key distribution – the foundations of the prospective quantum internet. We may come back to quantum computer in detail – but for now let me show you why their advent will demand a quantum internet.
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Views: 265058
PBS Space Time

This video explains what is quantum entanglement and how does it work. Enjoy!

Views: 8657
Daniel Liu

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: 528
intrigano

Views: 380
uclaphysicsvideo

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: 232
S4 Events

Views: 1781
uclaphysicsvideo

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: 12880
NICTchannel

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: 17101
Institute for Quantum Computing

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: 730
Institute for Quantum Computing

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: 341
The Audiopedia

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: 242
Quantum ICT Laboratory, NICT JAPAN

Topics covered: Cryptography, OTP and QKD, physical qubits, quantum coin flipping, quantum cloning circuit, Bell state circuit, quantum teleportation circuit.

Views: 1866
Quantum Computing

Chao Wang, Wei Chen, Fang-Xiang Wang, Yu-Yang Ding, Yong-Jun Qian, Shuang Wang, Zhen-Qiang Yin, Guang-Can Guo, and Zheng-Fu Han, "Measurement-device-independent quantum key distribution in practical scenarios", QCrypt2017, Tu24, 18-22 Sept 2017, Cambridge UK

Views: 161
QCrypt2017

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: 581
Gideon Samid

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

Views: 285
QCrypt2017

Temasek Foundation Ecosperity is supporting S-Fifteen Pte Ltd to develop tamper-proof terrestrial Quantum Key Distribution devices, including the key generation source (to be used for encryption), detector module, interface module and associated communication protocol software, and commercialise them for use as turnkey services.

Views: 134
Temasek Foundation Ecosperity

Views: 335
uclaphysicsvideo

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 (see no-cloning theorem). It is usually explained as a method of securely communicating a private key from one party to another for use in one-time pad encryption.
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: 217
satnamo

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: 4072
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: 1132
Microsoft Research

Provably Secure Three-Party Authenticated Quantum Key Distribution Protocol Project Execution
Presentation Layer: Windows Forms (WinForms)
Business Logic Layer: C#.NET
Data Access Layer: ADO.NET
Database: SQL Server 2008

Views: 743
Avinash Varma

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: 1392
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: 314
Institute for Quantum Computing

Contributed Talk 3 by Boris Korzh at 5th International Conference on Quantum Cryptography (QCrypt 2015) in Hitotsubashi Hall, Tokyo, September 28th, 2015.
Title: "Detector-device-independent quantum key distribution: From proof of principle to a high speed implementation."
Download the slides at: http://2015.qcrypt.net/scientific-program/

Views: 266
QCrypt 2015

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: 1277
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: 1624
media.ccc.de

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: 285
QCrypt 2015

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: 342
SpecialDuJour2008

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: 48248
Scott Manley

Introductory video of Quantum Key Distribution (2010) 9 minutes

Views: 1140
Quantum ICT Laboratory, NICT JAPAN

SK Telecom, byword of Challenge and Innovation got a successful demonstration of its QKD system at Busan World IT Show 2014. If you need this video, please contact us with [email protected]

Views: 4838
Sean Kwak

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: 287
Asso HZV

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