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.

a United States Federal Government standard or FIPS for digital signatures. It was proposed by the National Institute of Standards and Technology (NIST) in Aug…
349 questions
a request to be provided with a source from documentation, official papers, and specs related to one or more specific algorithms or cryptographic procedures. Open ended literatu…
348 questions
(or Data Encryption Standard), a (symmetric) block cipher using a 64 bit block size, with keys of size 56 bit, the standard US block cipher from 1976 to 2001.
a system of arithmetic for integers, where numbers "wrap around" upon reaching a certain value… the modulus.
A cipher which uses a different encryption key every time, as long as the message. The key is XOR'ed with the message to render the cipher text which can then be XOR'ed with the same key to get the p…
319 questions
Multi-party computation (MPC) allows a set of parties, each with a private input, to securely and jointly perform any computation over their inputs.
a family of deterministic functions indexed by a parameter, such that a randomly selected instance is computationally indistinguishable from a uniformly random functi…
311 questions
a measure of how predictable the outcome of a random process is, or how much uncertainty one has about an unknown quantity in one's state of knowledge, defined in terms of the probability d…
301 questions
Unique data used by block cipher modes of operation to randomize the output in order to achieve semantic security. Also for other similar constructs in other iterative algorithms.
300 questions
ways of applying a block cipher to multi-block messages and enabling repeated use without changing the key.
287 questions
an integer greater than 1 with no divisors other than itself and 1. Primes and prime products play an important role in public key cryptography.
279 questions
A cryptographic attack tries to theoretically and/or practically attack the security properties of a cipher and/or algorithm.
an open source implementation of the SSL and TLS protocols. Questions about how to use the OpenSSL tools and libraries are usually better asked at Stack Overflow or Super User.
the study and use of lattice problems applied to cryptography.
a mathematical construct based on a set of axioms which are held to be true. A number of interesting and useful properties arise from finite fields that makes them particularly suita…
268 questions
attempting to find a secret value by trying all possible values until the correct one is found.
267 questions
a public key encryption scheme with security based on the discrete logarithm problem.
265 questions
the size measured in bits of the key used in a cryptographic algorithm.
249 questions
Questions about the meaning and proper use of specific technical terms or notation within cryptography.
a hash function that is two generations old, no longer considered secure for all uses and should only be used for backward compatibility.
244 questions
Padding has two primary uses in cryptography, ensuring messages are the proper length necessary for certain ciphers (e.g., block ciphers) or to provide assurances not built into the core cipher (e.g.,…
239 questions
The Galois Counter Mode, an authenticated encryption mode of operation for a block cipher.
one of the basic operations on bits and bit-sequences. It is a building block of many cryptographic primitives (and some higher-level algorithms, like modes of operations).
The decomposition of an integer number to the product of other integers. Algorithms such as RSA are based on the premise that no practical way has been found was to factorize large integers when they …
238 questions
an abstract algebraic concept based on a set and a group law (a binary function which closes the set).
The attacker can specify his own plain text and encrypt or sign it.
220 questions
A certificate consists of a public key and information about the owner (e. g. the name of a person or server).
216 questions
a hash function that is no longer considered secure from a cryptographic point of view. Therefore, it should only be used for backward compatibility.
214 questions
The Password-Based Key Derivation Function 2 (PBKDF2) is a method of securely deriving encryption keys from a passphrase entered by a user. It features an iteration count that can be deliberately adju…
205 questions
Pairing-based cryptography uses bilinear maps to create a gap group that allows efficient constructions of certain primitives.
202 questions
Ciphers invented before the era of computers and modern cryptographic theory. Classical ciphers typically operate on letters instead of bits and are usually designed to be implemented by hand or using…
202 questions
The OpenPGP encrypted data format (RFC 4880), and its implementations PGP and GnuPG.
201 questions
easy to compute but hard to invert (i.e. find preimages for). The existence of one-way functions implies the possibility of many useful cryptographic schemes. No one-way functions …
198 questions
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…
(or substitution boxes), components in many block ciphers used to substitute parts of the data in a non-linear way. While often fixed by the algorithm (like in DES and AES), sometimes they are key-dep…
194 questions
an encryption mode, that builds a random-access stream-cipher from a block-cipher.
192 questions
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