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substitution algorithm

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  • Algorithm characterizations — The word algorithm does not have a generally accepted definition. Researchers are actively working in formalizing this term. This article will present some of the characterizations of the notion of algorithm in more detail. This article is a… …   Wikipedia

  • Algorithm — Flow chart of an algorithm (Euclid s algorithm) for calculating the greatest common divisor (g.c.d.) of two numbers a and b in locations named A and B. The algorithm proceeds by successive subtractions in two loops: IF the test B ≤ A yields yes… …   Wikipedia

  • Substitution cipher — In cryptography, a substitution cipher is a method of encryption by which units of plaintext are replaced with ciphertext according to a regular system; the units may be single letters (the most common), pairs of letters, triplets of letters,… …   Wikipedia

  • Substitution matrix — In evolutionary biology, a substitution matrix describes the rate at which one character in a sequence changes to other character states over time. Substitution matrices are usually seen in the context of amino acid or DNA sequence alignments,… …   Wikipedia

  • Substitution box — In cryptography, a substitution box (or S box) is a basic component of symmetric key algorithms. In block ciphers, they are typically used to obscure the relationship between the plaintext and the ciphertext mdash; Shannon s property of confusion …   Wikipedia

  • Substitution-permutation network — In cryptography, an SP network, or substitution permutation network (SPN), is a series of linked mathematical operations used in block cipher algorithms such as AES.These networks consist of S boxes and P boxes that transform blocks of input bits …   Wikipedia

  • Tridiagonal matrix algorithm — The tridiagonal matrix algorithm (TDMA), also known as the Thomas algorithm , is a simplified form of Gaussian elimination that can be used to solve tridiagonal systems of equations. A tridiagonal system for n unknowns may be written as:a i x {i… …   Wikipedia

  • Data Encryption Algorithm — DES Eine Feistel Runde (F Funktion) Entwickler IBM Veröffentlicht 1975 Abgeleitet von Lucifer …   Deutsch Wikipedia

  • Smith-Waterman algorithm — The Smith Waterman algorithm is a well known algorithm for performing local sequence alignment; that is, for determining similar regions between two nucleotide or protein sequences. Instead of looking at the total sequence, the Smith Waterman… …   Wikipedia

  • Extended Euclidean algorithm — The extended Euclidean algorithm is an extension to the Euclidean algorithm for finding the greatest common divisor (GCD) of integers a and b : it also finds the integers x and y in Bézout s identity: ax + by = gcd(a, b). ,(Typically either x or… …   Wikipedia

  • Luhn algorithm — The Luhn algorithm or Luhn formula, also known as the modulus 10 or mod 10 algorithm, is a simple checksum formula used to validate a variety of identification numbers, such as credit card numbers, IMEI numbers, National Provider Identifier… …   Wikipedia

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