A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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side channel attack based on the different speed at which certain operations are executed.
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an encryption algorithm which is based on the shortest vector problem in a lattice.
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A public-key cryptosystem invented by Pascal Paillier in 1999.
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Confidentiality in a very strong sense. Ciphers reaching perfect-secrecy can't be broken to disclose informations over the plaintext from the ciphertext, even with unlimited computing power. The most …
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Questions on the meaning, history, and usage of symbols and notation in cryptography. Please remember to mention where (book, paper, webpage, etc.) you encountered any notation you are asking about.
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Linear Feedback Shift Register, a pseudorandom bit generator which can be efficiently implemented in hardware.
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an algorithm for producing digital signatures. The algorithm is based on Edwards curves introduced by Bernstein et al. (2007) and named after mathematician Harold M. Edwards.
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the reduction in size of data without losing information.
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Multiple encryption means encrypting a message two or more times using either the same, or a different algorithm.
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a cryptographic hash function standardized by NIST as a new alternative to the SHA-2 hash function family.
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a function that cannot be distinguished (with practical effort) from a permutation selected at random with uniform probability from the family of all permutations …
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an active attack where the attacker is able to interpose himself between the sender and receiver. The attacker may monitor and/or modify some or all of the messag…
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a type of public-key encryption in which the key used for encryption is based on selected attributes of the readers. Decryption of the ciphertext is possible only if the …
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A digital signature scheme based on the discrete logarithm problem, published by Taher ElGamal in 1984. Not to be confused with the ElGamal encryption system.
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A slow and memory-intensive hash function designed for passwords
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used to estimate the likelihood of a hypothesis given a set of data. In cryptanalysis, statistical testing is commonly used to detect non-randomness in the data, e.g. distinguis…
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A structured set of data held in a computer, esp. one that is accessible in various ways.
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a protocol where one party commits themselves to a secret value without revealing it. At a later point, the value can be revealed.
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a sequence of bytes or bits, having a fixed length (the block-size).
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History of cryptography and cryptanalysis. Questions that wish to ask about the history of cryptography should use this tag; if you're asking about historical ciphers you may also wish to use the clas…
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a modern cryptographic protocol for password authenticated key exchange (PAKE). It provides some desireable properties, like a passive eavesdropper being unabl…
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the art and science of writing hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message. While cryptography prot…
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an encryption algorithm that can be used as a replacement for the DES or IDEA algorithms. Blowfish was designed in 1993 by Bruce Schneier as an alternative to existing encryption algorithm…
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the act of transforming information from one form to another. In cryptography, encoding is typically used to refer to an unkeyed process that does not provide any security in itself, but j…
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produces ciphertext that, by itself, does not reveal information about the original message besides its length
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a family of stream ciphers built on a pseudo-random function.
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Quantum cryptography describes the use of quantum mechanical effects to perform cryptographic tasks or to break cryptographic systems.
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part of the SHA-2 family of hash functions with a 512-bit output and a 256-bit security level.
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Difficulty of finding another input string that hashes to the same value as a given string
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a digital peer-to-peer currency with no central authority. It was created in 2009 by Satoshi Nakamoto. Transactions are managed entirely by the network.
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based on a mathematical problem that is moderate hard to solve but easy to verify.
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the process of generating keys for cryptographic purposes.
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a known plaintext attack and uses a linear approximation to describe the behavior of the block cipher. Given sufficient pairs of plaintext and corresponding ciphertext, bits of…
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a form of cryptanalysis which studies cryptographic algorithms by observing how differences in input affect differences on output.
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a cryptographic hash function designed by Guido Bertoni, Joan Daemen, Michaël Peeters, and Gilles Van Assche.
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a method of hierarchically hashing data. They allow efficient parallel hashing and updates and the possibility of verifying partial data.