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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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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a structure that has been used to create a number of different block ciphers (e.g., DES, Blowfish, Twofish, RC6).
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In a cryptographic sense, integrity means unimpaired and complete.
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Anonymity describes the state of being unknown or unacknowledged.
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A backdoor in a cryptosystem or algorithm allows someone to obtain access to the decrypted data, without the need for the key/password that was used to encrypt the data.
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a password that is valid for only one session or transaction.
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Linear Feedback Shift Register, a pseudorandom bit generator which can be efficiently implemented in hardware.
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based on a mathematical problem that is moderate hard to solve but easy to verify.
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Performance defines the abilities of a cipher in terms of processing throughput on various platforms, including its memory requirements.
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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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the central producer and manager of signals intelligence for the United States Government.
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a key derivation function specified in RFC5869.
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a historic polygraphic substitution cipher invented by Lester S. Hill in 1929.
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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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A public-key cryptosystem invented by Pascal Paillier in 1999.
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a cryptographic hash function designed by Guido Bertoni, Joan Daemen, Michaël Peeters, and Gilles Van Assche.
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The term "pen and paper" can practically be interpreted as "using no tools like electronic devices", since it targets cryptographic functions, schemes, and procedures which can be handled by humans wh…
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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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produces ciphertext that, by itself, does not reveal information about the original message besides its length
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A general tag for security analysis that cannot be more accurately categorised.
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a method of building a message authentication code from a block-cipher.
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the reduction in size of data without losing information.
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In a blind signature scheme, the signer does not know what he is signing. This is an important building block of anonymous voting or digital cash schemes, because it allows an authority to control the…
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Difficulty of finding another input string that hashes to the same value as a given string
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said to be malleable if it is feasible to modify ciphertext to produce meaningful changes in the corresponding plaintext without knowing the encryption key.
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an optimized brute-force attack that significantly reduces the number of keys the attacker needs to try by utilizing a time-space trade-off. Work is done from the begi…
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an asymmetric encryption algorithm and is a candidate for "post-quantum cryptography", as it is immune to attacks using Shor's algorithm and — more generally — measuring coset…
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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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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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side channel attack based on the different speed at which certain operations are executed.
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a classical cipher that shifts each plaintext character by the value of the key at the same position modulo the key-length.
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A length extension attack on a hash or message authentication code function, which allows extra information to be added to the input message without changing the output value.
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The HMAC-based one-time password algorithm defined in RFC 4226.
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Format-preserving encryption (FPE) refers to encrypting in such a way that the output has the same length as the input, or otherwise has the same format or structure as the input.
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a dynamic, object-oriented, prototype-based, weakly typed language commonly used for scripting in web browsers. Despite the name, it is unrelated to the Java programming language and sha…
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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…