Quantum cryptography | Cryptography | Quantum information science
Quantum key distribution (QKD) is a secure communication method which implements a cryptographic protocol involving components of quantum mechanics. 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. The main drawback of quantum key distribution is that it usually relies on having an authenticated classical channel of communications. In modern cryptography, having an authenticated classical channel means that one has either already exchanged a symmetric key of sufficient length or public keys of sufficient security level. With such information already available, in practice one can achieve authenticated and sufficiently secure communications without using QKD, such as by using the Galois/Counter Mode of the Advanced Encryption Standard. Thus QKD does the work of a stream cipher at many times the cost. 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. (Wikipedia).
Key Distribution - Applied Cryptography
This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
From playlist Applied Cryptography
Quantum Physics Full Course | Quantum Mechanics Course
Quantum physics also known as Quantum mechanics is a fundamental theory in physics that provides a description of the physical properties of nature at the scale of atoms and subatomic particles. It is the foundation of all #quantum #physics including quantum chemistry, quantum field theory
From playlist Quantum Mechanics
Quantum Well Density of States
https://www.patreon.com/edmundsj If you want to see more of these videos, or would like to say thanks for this one, the best way you can do that is by becoming a patron - see the link above :). And a huge thank you to all my existing patrons - you make these videos possible. Perhaps almos
From playlist Quantum Mechanics
Quantum Computer in a Nutshell (Documentary)
The reservoir of possibilities offered by the fundamental laws of Nature, is the key point in the development of science and technology. Quantum computing is the next step on the road to broaden our perspective from which we currently look at the Universe. The movie shows the history of pr
From playlist Quantum computing
Quantum Theory - Full Documentary HD
Check: https://youtu.be/Hs_chZSNL9I The World of Quantum - Full Documentary HD http://www.advexon.com For more Scientific DOCUMENTARIES. Subscribe for more Videos... Quantum mechanics (QM -- also known as quantum physics, or quantum theory) is a branch of physics which deals with physica
From playlist TV Appearances
Quantum Mechanics 1.1: Introduction
In this video I provide some motivation behind the development of quantum mechanics, kicking off a new series on everything you've been wondering about quantum mechanics! Twitter: https://twitter.com/SciencePlease_
From playlist Quantum Mechanics
Quantum Mechanics Concepts: 1 Dirac Notation and Photon Polarisation
Part 1 of a series: covering Dirac Notation, the measurable Hermitian matrix, the eigenvector states and the eigenvalue measured outcomes and application to photon polarisation
From playlist Quantum Mechanics
Probability Distribution Functions
We explore the idea of continuous probability density functions in a classical context, with a ball bouncing around in a box, as a preparation for the study of wavefunctions in quantum mechanics.
From playlist Quantum Mechanics Uploads
Linear algebra for Quantum Mechanics
Linear algebra is the branch of mathematics concerning linear equations such as. linear functions and their representations in vector spaces and through matrices. In this video you will learn about #linear #algebra that is used frequently in quantum #mechanics or #quantum #physics. ****
From playlist Quantum Physics
GET NORDVPN: https://nordvpn.org/sabine USE COUPON CODE: sabine USE THE CODE SO YOU CAN GET 68% off 2-year plan + 1 additional month FREE. You can learn more about NordVPN on their YouTube channel: https://www.youtube.com/channel/UCSZhRxyloC-qzURiOa3vbFQ Note: At 7 min 52 secs "vertical
From playlist Physics
24C3: Quantum Cryptography and Possible Attacks
Speakers: Alexander Ling, Antia Lamas, Ilja Gerhardt, Christian Kurtsiefer Quantum cryptography is the oldest and best developed application of the field of quantum information science. Although it is frequently perceived as an encryption method, it is really a scheme to securely distri
From playlist 24C3: Full steam ahead
Anne Broadbent - Information-Theoretic Quantum Cryptography Part 1 of 2 - IPAM at UCLA
Recorded 27 July 2022. Anne Broadbent of the University of Ottawa presents "Information-Theoretic Quantum Cryptography" at IPAM's Graduate Summer School Post-quantum and Quantum Cryptography. Abstract: These lectures are an introduction to the interplay between quantum information and cryp
From playlist 2022 Graduate Summer School on Post-quantum and Quantum Cryptography
Nexus Trimester - Stephanie Wehner (Delft University of Technology)
Device-independence in quantum cryptography Stephanie Wehner (Delft University of Technology) March 22, 2016 Abstract: While quantum cryptography offers interesting security guarantees, it is challenging to build good quantum devices. In practise, we will therefore typically rely on devi
From playlist Nexus Trimester - 2016 - Secrecy and Privacy Theme
Chem 131A. Lec 04. Quantum Principles: Complementarity, Quantum Encryption, Schrodinger Equation
UCI Chem 131A Quantum Principles (Winter 2014) Lec 04. Quantum Principles -- Complementarity, Quantum Encryption, Schrodinger Equation -- View the complete course: http://ocw.uci.edu/courses/chem_131a_quantum_principles.html Instructor: A.J. Shaka, Ph.D License: Creative Commons BY-NC-SA
From playlist Chem 131A: Week 2
Why Quantum Computing Requires Quantum Cryptography
Learn more about Audible at: https://www.audible.com/spacetime or text spacetime to 500 500! PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE Quantum computing is cool, but you know what would be extra awesome - a quantum i
From playlist Space Time!
An Uncrackable Code? (Quantum Cryptography) - A Quantum Scientist Explains #QuantumMinutes
Note: at 8:55 it be should ½ x ½ = ¼ of course, not + What is Quantum Cryptography? Today's host, Dr. Lukas Knips, is a quantum researcher in the group of Prof. Harald Weinfurter at the Ludwig-Maximilians-Universität (LMU) München in Germany. His research focusses on free-space Quantum Ke
From playlist Summer of Math Exposition Youtube Videos
Quantum Cryptography | CaltechX and DelftX on edX | Course About Video
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 co
From playlist Research & Science
Quantum Field Theory 2b - Field Quantization II
Here we complete the "quantum field theory" of a vibrating string. (Note: My voice is lower and slower than normal - I was coming down with a cold.) Errors: At 0:42 I say "minus c-squared times q-k..." I should have said, "minus c-squared times quantity k pi over L squared, times q-k..."
From playlist Quantum Field Theory
Adeline Roux-Langlois : Using structured variants in lattice-based cryptography - Lecture 1
CONFERENCE Recording during the thematic meeting : « Francophone Computer Algebra Days» the March 06, 2023 at the Centre International de Rencontres Mathématiques (Marseille, France) Filmmaker: Jean Petit Find this video and other talks given by worldwide mathematicians on CIRM's Audiov
From playlist Mathematical Aspects of Computer Science