Tags

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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 pseudo-random-permutation× 32 a function that cannot be distinguished (with practical effort) from a permutation selected at random with uniform probability from the family of all permutations … performance× 32 Performance defines the abilities of a cipher in terms of processing throughput on various platforms, including its memory requirements. ed25519× 32 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. scrypt× 32 A slow and memory-intensive hash function designed for passwords elgamal-signature× 31 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. man-in-the-middle× 31 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… multiple-encryption× 30 Multiple encryption means encrypting a message two or more times using either the same, or a different algorithm. commitments× 30 a protocol where one party commits themselves to a secret value without revealing it. At a later point, the value can be revealed. sha-3× 30 a cryptographic hash function standardized by NIST as a new alternative to the SHA-2 hash function family. database× 29 A structured set of data held in a computer, esp. one that is accessible in various ways. blowfish× 28 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… perfect-secrecy× 28 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 … sha-512× 28 part of the SHA-2 family of hash functions with a 512-bit output and a 256-bit security level. statistical-test× 28 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… srp× 28 a modern cryptographic protocol for password authenticated key exchange (PAKE). It provides some desireable properties, like a passive eavesdropper being unabl… timing-attacks× 26 side channel attack based on the different speed at which certain operations are executed. lattice-crypto× 26 identity-based-encryption× 26 In identity-based encryption (IBE) the public key of a user $A$ is some identity string $ID_A$, e.g., an email address. To encrypt a message for this user there is no need to retrieve an authentic cop… anonymity× 26 Anonymity describes the state of being unknown or unacknowledged. blind-signature× 25 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… keccak× 25 a cryptographic hash function designed by Guido Bertoni, Joan Daemen, Michaël Peeters, and Gilles Van Assche. ntru× 25 an encryption algorithm which is based on the shortest vector problem in a lattice. proof-of-work× 25 based on a mathematical problem that is moderate hard to solve but easy to verify. one-time-password× 24 a password that is valid for only one session or transaction. 2nd-preimage-resistance× 24 Difficulty of finding another input string that hashes to the same value as a given string blocksize× 24 a sequence of bytes or bits, having a fixed length (the block-size). forward-secrecy× 24 A security property wherein past messages are protected against future compromise of the master keys. history× 24 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… ssh× 24 an authentication protocol (described in RFC 4252) for securely getting access to a remote computer. oblivious-transfer× 23 Oblivious transfer refers to a cryptographic protocol in which a sender possesses a set of data and a receiver queries the sender for a particular member of that set in such a way that the sender does… notation× 23 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. meet-in-the-middle-attack× 23 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… pen-and-paper× 22 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… quantum-cryptography× 22 Quantum cryptography describes the use of quantum mechanical effects to perform cryptographic tasks or to break cryptographic systems. hkdf× 22 a key derivation function specified in RFC5869. bitcoin× 22 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.