# 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.

 Type to find tags:
 ecdsa× 26 a signature algorithm. It is the elliptic curve (EC) implementation of the digital signature algorithm (DSA). ecks-ps ed25519× 2 education elgamal× 42 a public key encryption scheme and signature scheme with security based on the discrete logarithm problem. elgamal-signature× 7 A digital signature scheme based on the discrete logarithm problem, published by Taher ElGamal in 1984. Not to be confused with the ElGamal encryption system. elliptic-curves× 73 a mathematical structure. In cryptography, it is common to use the structure $y^2 = x^3 + ax^2 + b$ over a finite field. Questions relating to elliptic curves and derived algorithm… encrypted-functions encryption× 391 the process of transforming plaintext using a cipher to make it unreadable to anyone except those possessing the key. enigma× 3 The Enigma Machine was a piece of cryptographic hardware used by the German military during World War II; successful cryptanalysis was routinely applied against it and the scheme was considered broken… entropy× 28 a measure of information content, which can be viewed as the uncertainty in a random selection. error-correction etcr factorization× 27 the problem of taking an integer and finding the set of prime numbers that produce the integer when multiplied together. For large integers with large factors, factorization is hard a… feal feistel-network× 8 a structure that has been used to create a number of different block ciphers (e.g., DES, Blowfish, Twofish, RC6). fiat-shamir× 2 file-encryption× 29 The process of encrypting individual files on a storage medium and permitting access to the encrypted data only after proper authentication is provided. finite-field× 13 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… fips-140× 3 forgery× 6 format-preserving× 6 functional-encryption× 3 function-evaluation× 3 gcm× 13 The Galois Counter Mode, an authenticated encryption mode of operation for a block cipher. gnupg gpg group-theory× 14 an abstract algebraic concept based on a set and a group law (a binary function which closes the set). hash× 267 a function which takes a variable size input and produces a fixed size output. The algorithm makes it difficult to predict the output for a given input, find two inpu… hash-collision× 42 any pair of values (preimages) that when hashed produce the same digest (image). Finding even one example of a collision should be infeasible in a cryptographically secure hash fun… hashed-elgamal× 2 hash-tree× 3 hermitian-curves× 2 hill-cipher× 8 a historic polygraphic substitution cipher invented by Lester S. Hill in 1929. historic× 11 for questions about cryptographic algorithms which were invented (and used) before the computer age. history× 5 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…