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…
397 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.
373 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…
367 questions
a system of arithmetic for integers, where numbers "wrap around" upon reaching a certain value… the modulus.
362 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…
a family of deterministic functions indexed by a parameter, such that a randomly selected instance is computationally indistinguishable from a uniformly random functi…
Multi-party computation (MPC) allows a set of parties, each with a private input, to securely and jointly perform any computation over their inputs.
342 questions
the study and use of lattice problems applied to cryptography.
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.
331 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…
331 questions
A cryptographic attack tries to theoretically and/or practically attack the security properties of a cipher and/or algorithm.
325 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.
305 questions
ways of applying a block cipher to multi-block messages and enabling repeated use without changing the key.
303 questions
attempting to find a secret value by trying all possible values until the correct one is found.
298 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…
297 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.
295 questions
a public key encryption scheme with security based on the discrete logarithm problem.
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.,…
271 questions
Questions about the meaning and proper use of specific technical terms or notation within cryptography.
266 questions
The Galois Counter Mode, an authenticated encryption mode of operation for a block cipher.
263 questions
the size measured in bits of the key used in a cryptographic algorithm.
261 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 …
256 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).
255 questions
a hash function that is two generations old, no longer considered secure for all uses and should only be used for backward compatibility.
254 questions
The attacker can specify his own plain text and encrypt or sign it.
248 questions
an abstract algebraic concept based on a set and a group law (a binary function which closes the set).
247 questions
A certificate consists of a public key and information about the owner (e. g. the name of a person or server).
241 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.
234 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 …
226 questions
The OpenPGP encrypted data format (RFC 4880), and its implementations PGP and GnuPG.
220 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…
218 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…
an encryption mode, that builds a random-access stream-cipher from a block-cipher.
216 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…
216 questions
Questions about formal definitions of "security" for various cryptographic schemes (e.g. perfect secrecy, semantic security, ciphertext indistinguishability, etc.)
Pairing-based cryptography uses bilinear maps to create a gap group that allows efficient constructions of certain primitives.
214 questions
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