# corresponding+cipher

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**Wall box**— Wall boxes are a type of post box or letter box found in many countries including France, the United Kingdom, the Commonwealth of Nations, Crown dependencies and Ireland. They differ from pillar boxes in that, instead of being a free standing… …52

**MDC-2**— In cryptography, MDC 2 (Modification Detection Code 2, sometimes called Meyer Schilling) is a cryptographic hash function. MDC 2 is a hash function based on a block cipher with a proof of security in the ideal cipher model[1]. The length of the… …53

**Brute force attack**— In cryptanalysis, a brute force attack is a method of defeating a cryptographic scheme by trying a large number of possibilities; for example, possible keys in order to decrypt a message. In most schemes, the theoretical possibility of a brute… …54

**American and British English spelling differences**— Spelling differences redirects here. For other uses, see Category:Language comparison. For guidelines on dialects and spelling in the English language version of Wikipedia, see Wikipedia:Manual of Style#National varieties of English. Differences… …55

**Punchscan**— infobox software caption = developer = Richard Carback, David Chaum, Jeremy Clark, Aleks Essex, and Stefan Popoveniuc. released = frequently updated = yes programming language = Java operating system = Cross platform language = English genre =… …56

**Merkle–Hellman knapsack cryptosystem**— The Merkle–Hellman knapsack cryptosystem was one of the earliest public key cryptosystems invented by Ralph Merkle and Martin Hellman in 1978.[1] Although its ideas are elegant, and far simpler than RSA, it has been broken.[2] Contents 1… …57

**Key (cryptography)**— In cryptography, a key is a piece of information (a parameter) that determines the functional output of a cryptographic algorithm or cipher. Without a key, the algorithm would produce no useful result. In encryption, a key specifies the… …58

**Code (cryptography)**— For other uses, see Code (disambiguation). In cryptography, a code is a method used to transform a message into an obscured form, preventing those who do not possess special information, or key, required to apply the transform from understanding… …59

**Multiple channel cryptography**— Infobox block cipher name = MCC designers = Richard Ervasti publish date = 2008 ndash;02 key size = variable block size = variable structure = SPN rounds = 2 cryptanalysis = Multiple channel cryptography (MCC) is an emerging approach to block… …60

**Matrix (mathematics)**— Specific elements of a matrix are often denoted by a variable with two subscripts. For instance, a2,1 represents the element at the second row and first column of a matrix A. In mathematics, a matrix (plural matrices, or less commonly matrixes)… …