In cryptography, an adversary (rarely opponent, enemy) is a malicious entity whose aim is to prevent the users of the cryptosystem from achieving their goal (primarily privacy, integrity, and availability of data). An adversary's efforts might take the form of attempting to discover secret data, corrupting some of the data in the system, spoofing the identity of a message sender or receiver, or forcing system downtime. Actual adversaries, as opposed to idealized ones, are referred to as attackers. The former term predominates in the cryptographic and the latter in the computer security literature. Eve, Mallory, Oscar and Trudy are all adversarial characters widely used in both types of texts. This notion of an adversary helps both intuitive and formal reasoning about cryptosystems by casting security analysis of cryptosystems as a 'game' between the users and a centrally co-ordinated enemy. The notion of security of a cryptosystem is meaningful only with respect to particular attacks (usually presumed to be carried out by particular sorts of adversaries). There are several types of adversaries depending on what capabilities or intentions they are presumed to have. Adversaries may be * computationally bounded or unbounded (i.e. in terms of time and storage resources), * eavesdropping or Byzantine (i.e. passively listening on or actively corrupting data in the channel), * static or adaptive (i.e. having fixed or changing behavior), * mobile or non-mobile (e.g. in the context of network security) and so on. In actual security practice, the attacks assigned to such adversaries are often seen, so such notional analysis is not merely theoretical. How successful an adversary is at breaking a system is measured by its advantage. An adversary's advantage is the difference between the adversary's probability of breaking the system and the probability that the system can be broken by simply guessing. The advantage is specified as a function of the security parameter. (Wikipedia).

An informal introduction to cryptography. Part of a larger series teaching programming at http://codeschool.org

From playlist Cryptography

Cryptanalysis of Classical Ciphers

Cryptography and Network Security by Prof. D. Mukhopadhyay, Department of Computer Science and Engineering, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in

From playlist Computer - Cryptography and Network Security

Steganography Tutorial - Hide Messages In Images

Steganography is the hiding of a secret message within an ordinary message and the extraction of it at its destination. Steganography takes cryptography a step further by hiding an encrypted message so that no one suspects it exists. Ideally, anyone scanning your data will fail to know it

From playlist Ethical Hacking & Penetration Testing - Complete Course

Primality (1 of 2: Fermat's Test)

From playlist Cryptography

Few other Cryptanalytic Techniques

Cryptography and Network Security by Prof. D. Mukhopadhyay, Department of Computer Science and Engineering, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in

From playlist Computer - Cryptography and Network Security

Secure Computation Solution - 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

Threat Model Solution - 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

Cryptography - Seminar 1 - Foundations

This seminar series is about the mathematical foundations of cryptography. In the first seminar Eleanor McMurtry introduces cryptography and explains some of the problems that need to be solved in order to develop proper foundations. The webpage for this seminar is https://lnor.net/uc-sem

From playlist Metauni

Jonathan Katz - Introduction to Cryptography Part 1 of 3 - IPAM at UCLA

Recorded 25 July 2022. Jonathan Katz of the University of Maryland presents "Introduction to Cryptography I" at IPAM's Graduate Summer School Post-quantum and Quantum Cryptography. Abstract: This lecture will serve as a "crash course" in modern cryptography for those with no prior exposure

From playlist 2022 Graduate Summer School on Post-quantum and Quantum Cryptography

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

PMSP - Computational pseudo-randomness and extractors I - Russell Impagliazzo

Russell Impagliazzo UC San Diego and Institute for Advanced Study June 14, 2010 For more videos, visit http://video.ias.edu

From playlist Mathematics

Anne Broadbent - Information-Theoretic Quantum Cryptography Part 2 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

Cryptography - Seminar 3 - Protocols

This seminar series is about the mathematical foundations of cryptography. In this seminar Eleanor McMurtry gives the formal definitions of machines, protocols, execution and UC-emulation in the context of universal composability, the foundations of cryptography that are being presented in

From playlist Metauni

Eavesdropper Solution - 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

R11. Cryptography: More Primitives

MIT 6.046J Design and Analysis of Algorithms, Spring 2015 View the complete course: http://ocw.mit.edu/6-046JS15 Instructor: Ling Ren In this recitation, problems related to cryptography are discussed. License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More c

From playlist MIT 6.046J Design and Analysis of Algorithms, Spring 2015

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

SSH Authentication Solution - Applied Cryptography

From playlist Applied Cryptography

Network Security: Classical Encryption Techniques

Fundamental concepts of encryption techniques are discussed. Symmetric Cipher Model Substitution Techniques Transposition Techniques Product Ciphers Steganography

From playlist Network Security