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.

Complexity describes - in simple words - how hard (complex) it is to reach a specific goal; and under which conditions. In cryptography, this mostly ends up in using the complexity theory to analyze t…
209 questions
Questions about formal definitions of "security" for various cryptographic schemes (e.g. perfect secrecy, semantic security, ciphertext indistinguishability, etc.)
the study of the properties and construction of numbers, particularly integers. Prime numbers are of particular interest to number theorists and consequently cryptographers as they ar…
202 questions
a digital currency powered by cryptography. This tag is applicable only to Q&As about the cryptographic mechanisms used by a currency, not for questions about economy, usage, or ac…
unique (usually random) data passed into a hash function for password storage to avoid the possible usage of rainbow tables or similar attacks. Salt will not help against dictionary or brute f…
180 questions
The attacker knows at least one sample of both the plain text and the cipher text.
177 questions
attacks using information leaked by implementations of cryptographic algorithms to obtain information about keys or (plaintext) data, instead of (or additional to) using cryptographic weaknesses.
the detailed analysis of the security of an abstract or concrete cryptographic protocol.
170 questions
an attack model for cryptanalysis in which the cryptanalyst gathers information, at least in part, by choosing a ciphertext and obtaining its decryption under an un…
169 questions
a protocol where one party commits themselves to a secret value without revealing it. At a later point, the value can be revealed.
158 questions
an arbitrary number or string used only once within the context of a specific cryptographic scheme. Nonces are used e.g. in authentication protocols to prevent replay attacks, as well as …
155 questions
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 …
150 questions
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.
147 questions
The process of encrypting individual files on a storage medium and permitting access to the encrypted data only after proper authentication is provided.
146 questions
A way, esp. one of several possible variations, in which a set or number of things can be ordered or arranged.
144 questions
an encryption algorithm which works by replacing plaintext units with corresponding ciphertext units, following some rule depending on the key.
144 questions
Difficulty of finding an input string that hashes to a given value
144 questions
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.
144 questions
Encryption using a key derived from a password or passphrase entered by the user.
142 questions
a function that cannot be distinguished (with practical effort) from a permutation selected at random with uniform probability from the family of all permutations …
141 questions
a cryptographic hash function standardized by NIST as a new alternative to the SHA-2 hash function family.
136 questions
A public-key cryptosystem invented by Pascal Paillier in 1999.
134 questions
the process of encoding information. This process converts the original representation of the information, known as plaintext, into an alternative form known as cipherte…
134 questions
Deprecated tag, see tag info. Advanced Encryption Standard Galois/Counter Mode, better known as AES-GCM is a mode of operation for symmetric key cryptographic block ciphers that has been widely ado…
126 questions
a mode of operation for a block cipher, with the characteristic that each possible block of plaintext has a defined corresponding ciphertext value and vice versa.
126 questions
In a cryptographic sense, integrity means unimpaired and complete.
125 questions
a family of stream ciphers proposed by Daniel J. Bernstein, as an evolution of Salsa20 with (conjecturally) improved resistance to cryptanalysis.
123 questions
Linear Feedback Shift Register, a pseudorandom bit generator which can be efficiently implemented in hardware.
122 questions
a family of cryptographic hash functions designed by the NSA and published by NIST in 2001. The family includes various output lengths (224, 256, 384, and 512 bits).
120 questions
Cryptographic hardware enables the handling of cryptographic tasks and/or problems using hardware instead of software solutions.
119 questions
A model used in cryptographic security proofs, in which concrete primitives such as hash functions are replaced with a "random oracle": a hypothetical black box that maps its inputs to truly random ou…
115 questions
a form of cryptanalysis which studies cryptographic algorithms by observing how differences in input affect differences in output.
114 questions
a structure that has been used to create a number of different block ciphers (e.g., DES, Blowfish, Twofish, RC6).
111 questions
a classical cipher that shifts each plaintext character by the value of the key at the same position modulo the key-length.
110 questions
part of the SHA-2 family of hash functions with a 512-bit output and a 256-bit security level.
108 questions
thought to be difficult to solve for all cases in polynomial time
108 questions
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