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…
(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 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…
357 questions
a system of arithmetic for integers, where numbers "wrap around" upon reaching a certain value… the modulus.
343 questions
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…
Multi-party computation (MPC) allows a set of parties, each with a private input, to securely and jointly perform any computation over their inputs.
330 questions
a family of deterministic functions indexed by a parameter, such that a randomly selected instance is computationally indistinguishable from a uniformly random functi…
329 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.
321 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…
319 questions
A cryptographic attack tries to theoretically and/or practically attack the security properties of a cipher and/or algorithm.
305 questions
the study and use of lattice problems applied to cryptography.
296 questions
ways of applying a block cipher to multi-block messages and enabling repeated use without changing the key.
296 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.
293 questions
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.
291 questions
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…
287 questions
attempting to find a secret value by trying all possible values until the correct one is found.
a public key encryption scheme with security based on the discrete logarithm problem.
275 questions
the size measured in bits of the key used in a cryptographic algorithm.
257 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.,…
256 questions
The Galois Counter Mode, an authenticated encryption mode of operation for a block cipher.
255 questions
Questions about the meaning and proper use of specific technical terms or notation within cryptography.
252 questions
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).
248 questions
a hash function that is two generations old, no longer considered secure for all uses and should only be used for backward compatibility.
248 questions
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 …
248 questions
an abstract algebraic concept based on a set and a group law (a binary function which closes the set).
238 questions
The attacker can specify his own plain text and encrypt or sign it.
233 questions
A certificate consists of a public key and information about the owner (e. g. the name of a person or server).
231 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.
225 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 …
217 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…
216 questions
Pairing-based cryptography uses bilinear maps to create a gap group that allows efficient constructions of certain primitives.
213 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…
209 questions
The OpenPGP encrypted data format (RFC 4880), and its implementations PGP and GnuPG.
208 questions
an encryption mode, that builds a random-access stream-cipher from a block-cipher.
207 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…
205 questions
(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…
205 questions
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