Entropic security is a security definition used in the field of cryptography. Modern encryption schemes are generally required to protect communications even when the attacker has substantial information about the messages being encrypted. For example, even if an attacker knows that an intercepted ciphertext encrypts either the message "Attack" or the message "Retreat", a semantically secure encryption scheme will prevent the attacker from learning which of the two messages is encrypted. However, definitions such as semantic security are too strong to achieve with certain specialized encryption schemes. Entropic security is a weaker definition that can be used in the special case where an attacker has very little information about the messages being encrypted. It is well known that certain types of encryption algorithm cannot satisfy definitions such as semantic security: for example, deterministic encryption algorithms can never be semantically secure. Entropic security definitions relax these definitions to cases where the message space has substantial entropy (from an adversary's point of view). Under this definition it is possible to prove security of deterministic encryption. Note that in practice entropically-secure encryption algorithms are only "secure" provided that the message distribution possesses high entropy from any reasonable adversary's perspective. This is an unrealistic assumption for a general encryption scheme, since one cannot assume that all likely users will encrypt high-entropy messages. For these schemes, stronger definitions (such as semantic security or indistinguishability under adaptive chosen ciphertext attack) are appropriate. However, there are special cases in which it is reasonable to require high entropy messages. For example, encryption schemes that encrypt only secret key material (e.g., key encapsulation or Key Wrap schemes) can be considered under an entropic security definition. A practical application of this result is the use of deterministic encryption algorithms for secure encryption of secret key material. Russell and Wang formalized a definition of entropic security for encryption. Their definition resembles the semantic security definition when message spaces have highly-entropic distribution. In one formalization, the definition implies that an adversary given the ciphertext will be unable to compute any predicate on the ciphertext with (substantially) greater probability than an adversary who does not possess the ciphertext. Dodis and Smith later proposed alternate definitions and showed equivalence. (Wikipedia).
Network Security, Part 1 : Basic Encryption Techniques
Fundamental concepts of network security are discussed. It provides a good overview of secret Key and public key Encryption. Important data encryption standards are presented.
From playlist Network Security
EnCase Computer Forensics Demo
This is a short demo of EnCase I worked up. If you are interested in some of what professional computer forensics software can do then this is for you.
From playlist digital forensics
Fundamental concepts of IPSec are discussed. Authentication Header is explained. ESP & IKE are analyzed.
From playlist Network Security
Fundamental concepts of Digital Signatures are discussed. ElGamal and Schnorr Digital Signature schemes are analyzed. Digital signature standard is presented.
From playlist Network Security
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
Ultimate smartphone security guide | How to secure your phone tutorial
This is an ultimate security guide for mobile devices, both iOS and Android. Learn how to improve your smartphone security and protect your mobile phone and your private data. Support me through Patreon: https://www.patreon.com/thehatedone - or donate anonymously: Monero: 84DYxU8rPzQ88
From playlist TUTORIALS & HOW TO's
Quadratically regularized optimal transport - Lorenz - Workshop 1 - CEB T1 2019
Lorenz (Univ. Braunschweig) / 07.02.2019 Quadratically regularized optimal transport Among regularization techniques for optimal transport, entropic regularization has played a pivotal rule. The main reason may be its computational simplicity: the Sinkhorn-Knopp iteration can be impleme
From playlist 2019 - T1 - The Mathematics of Imaging
Nexus Trimester - Qi Chen (The Chinese University of Hong Kong)
Partition-Symmetrical Entropy Functions Qi Chen (The Chinese University of Hong Kong) February 15, 2016 Abstract: Let N={1,…,n}. Let p={N1,…,Nt} be a t-partition of N. An entropy function h is called p-symmetrical if for all A, B⊂N, h(A)=h(B) whenever |A∩Ni|=|B∩Ni|, i=1,…,t. We prove that
From playlist Nexus Trimester - 2016 - Fundamental Inequalities and Lower Bounds Theme
Predicting the Future of the Web Development (2020 and 2025)
Wonder what technologies and trends will dominate the web development in 2020 and 2025? EVENT: ReactiveConf 2019 SPEAKER: Richard Feldman PUBLICATION PERMISSIONS: Conference Organizers provided Coding Tech with the permission to republish the ReactiveConf videos. **** INTERESTED IN TH
From playlist Web Development
Digital security - threats, risks and how to protect yourself | Part I
Support this channel on Patreon https://www.patreon.com/thehatedone Part I of the full talk with Daniel from Safing.io. We discuss the current state of digital security, most common threats, GDPR, artificial intelligence and quantum computing. Monero: 84DYxU8rPzQ88SxQqBF6VBNfPU9c5sjDXfTC
From playlist Security by compartmentalization - learn to protect your privacy effectively
Nexus Trimester - František Matúš (Institute of Information Theory and Automation) 2/3
Entropy region and convolution František Matúš (Institute of Information Theory and Automation) February 19, 2016 Abstract: The entropy region is constructed from vectors of random variables by collecting Shannon entropies of all subvectors. We will review results on its shape using poly
From playlist Nexus Trimester - 2016 - Fundamental Inequalities and Lower Bounds Theme
Radek Adamczak: Functional inequalities and concentration of measure III
Concentration inequalities are one of the basic tools of probability and asymptotic geo- metric analysis, underlying the proofs of limit theorems and existential results in high dimensions. Original arguments leading to concentration estimates were based on isoperimetric inequalities, whic
From playlist Winter School on the Interplay between High-Dimensional Geometry and Probability
The Laws of Thermodynamics, Entropy, and Gibbs Free Energy
We've all heard of the Laws of Thermodynamics, but what are they really? What the heck is entropy and what does it mean for the fate of the universe? How does soap work?! So many questions answered in this clip! Enjoy! More thorough thermodynamics tutorials: https://www.youtube.com/watch?
From playlist General Chemistry
Private Messages 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
Organic Chemistry Practice Exam 10
While I'm in quarantine with no access to YouTube studios to shoot my regular content, I thought I might as well give everyone some organic chemistry review! Pause the video if you want to try a question on your own, and then listen to the explanation. Happy studying! Try all of the organ
From playlist Organic Chemistry Practice Problems
Nexus trimester - Tarik Kaced (Université de Paris-Est, LACL, UPEC)
Dual Information Inequalities Tarik Kaced (Université de Paris-Est, LACL, UPEC) february 24, 2016 Abstract: The duality for entropic matroids and polymatroids is discussed under the lens of information inequalities. We define the dual of an information inequality and ask whether the new d
From playlist Nexus Trimester - 2016 - Fundamental Inequalities and Lower Bounds Theme
Fundamental concepts of intrusion detection are discussed. Various types of intrusion are analyzed. Password management is explained.
From playlist Network Security
Bitcoin Q&A: How Do Mnemonic Seeds Work?
What cryptography *magic* makes mnemonic seed words work? How is randomness generated? Can seed words be imported into more than one wallet? More on wallets and mnemonic code words - https://github.com/bitcoinbook/bitcoinbook/blob/f8b883dcd4e3d1b9adf40fed59b7e898fbd9241f/ch05.asciidoc BI
From playlist English Subtitles - aantonop Videos with subtitles in English
Fundamental concepts of Digital Signatures are discussed. ElGamal and Schnorr Digital Signature schemes are analyzed. Digital signature standard is presented.
From playlist Network Security