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.

Type to find tags:
× 17
a structure that has been used to create a number of different block ciphers (e.g., DES, Blowfish, Twofish, RC6).
× 17
Anonymity describes the state of being unknown or unacknowledged.
× 17
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.
× 17
a protocol where one party commits themselves to a secret value without revealing it. At a later point, the value can be revealed.
× 17
a password that is valid for only one session or transaction.
× 17
The National Institute of Standards and Technology (NIST) is a U.S. federal agency that works with industry to develop and apply technology, measurements, and standards.
× 17
based on a mathematical problem that is moderate hard to solve but easy to verify.
× 16
Performance defines the abilities of a cipher in terms of processing throughput on various platforms, including its memory requirements.
× 16
the central producer and manager of signals intelligence for the United States Government.
× 16
Linear Feedback Shift Register, a pseudorandom bit generator which can be efficiently implemented in hardware.
× 16
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…
× 16
a key derivation function specified in RFC5869.
× 15
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…
× 15
A public-key cryptosystem invented by Pascal Paillier in 1999.
× 15
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…
× 15
produces ciphertext that, by itself, does not reveal information about the original message besides its length
× 14
a cryptographic hash function standardized by NIST as a new alternative to the SHA-2 hash function family.
× 14
a method of building a message authentication code from a block-cipher.
× 14
the reduction in size of data without losing information.
× 14
a historic polygraphic substitution cipher invented by Lester S. Hill in 1929.
× 14
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…
× 13
a cryptographic hash function designed by Guido Bertoni, Joan Daemen, Michaël Peeters, and Gilles Van Assche.
× 13
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…
× 13
Difficulty of finding another input string that hashes to the same value as a given string
× 13
A general tag for security analysis that cannot be more accurately categorised.
× 13
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.
× 13
said to be malleable if it is feasible to modify ciphertext to produce meaningful changes in the corresponding plaintext without knowing the encryption key.
× 13
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…
× 13
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…
× 12
The HMAC-based one-time password algorithm defined in RFC 4226.
× 12
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.
× 12
side channel attack based on the different speed at which certain operations are executed.
× 12
a classical cipher that shifts each plaintext character by the value of the key at the same position modulo the key-length.
× 11
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…
× 11
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…
× 11
a type of cryptography that allows an encrypted text to be decrypted in two or more ways, depending on which decryption key is used.