32 relations: Backdoor (computing), Bent function, Bijection, Bit, Block cipher, Blowfish (cipher), Boolean function, Brighton, Carlisle Adams, Cipher, Ciphertext, Claude Shannon, Confusion and diffusion, Cryptanalysis, Cryptography, Data Encryption Standard, Differential cryptanalysis, Eurocrypt, John Wiley & Sons, Kaisa Nyberg, Key (cryptography), Lookup table, Nothing up my sleeve number, Permutation box, Portable Document Format, PostScript, Queen's University, Rijndael S-box, Selected Areas in Cryptography, Substitution cipher, Symmetric-key algorithm, Twofish.

## Backdoor (computing)

A backdoor in a computer system (or cryptosystem or algorithm) is a method of bypassing normal authentication, securing unauthorized remote access to a computer, obtaining access to plaintext, and so on, while attempting to remain undetected.

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## Bent function

In the mathematical field of combinatorics, a bent function is a special type of Boolean function.

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## Bijection

In mathematics, a bijection, bijective function or one-to-one correspondence is a function between the elements of two sets, where every element of one set is paired with exactly one element of the other set, and every element of the other set is paired with exactly one element of the first set.

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## Bit

A bit is the basic unit of information in computing and digital communications.

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## Block cipher

In cryptography, a block cipher is a deterministic algorithm operating on fixed-length groups of bits, called blocks, with an unvarying transformation that is specified by a symmetric key.

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## Blowfish (cipher)

Blowfish is a symmetric-key block cipher, designed in 1993 by Bruce Schneier and included in a large number of cipher suites and encryption products.

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## Boolean function

In mathematics and logic, a (finitary) Boolean function (or switching function) is a function of the form ƒ: Bk → B, where B.

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## Brighton

Brighton is a seaside resort and the largest part of the city of Brighton and Hove situated in East Sussex, England.

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## Carlisle Adams

Carlisle M. Adams is a cryptographer and computer security researcher.

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## Cipher

In cryptography, a cipher (or cypher) is an algorithm for performing encryption or decryption—a series of well-defined steps that can be followed as a procedure.

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## Ciphertext

In cryptography, ciphertext (or cyphertext) is the result of encryption performed on plaintext using an algorithm, called a cipher.

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## Claude Shannon

Claude Elwood Shannon (April 30, 1916 – February 24, 2001) was an American mathematician, electronic engineer, and cryptographer known as "the father of information theory".

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## Confusion and diffusion

In cryptography, confusion and diffusion are two properties of the operation of a secure cipher which were identified by Claude Shannon in his paper Communication Theory of Secrecy Systems, published in 1949.

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## Cryptanalysis

Cryptanalysis (from the Greek kryptós, "hidden", and analýein, "to loosen" or "to untie") is the study of analyzing information systems in order to study the hidden aspects of the systems.

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## Cryptography

Cryptography or cryptology; from Greek κρυπτός kryptós, "hidden, secret"; and γράφειν graphein, "writing", or -λογία -logia, "study", respectively is the practice and study of techniques for secure communication in the presence of third parties (called adversaries).

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## Data Encryption Standard

The Data Encryption Standard (DES, or) was once a predominant symmetric-key algorithm for the encryption of electronic data.

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## Differential cryptanalysis

Differential cryptanalysis is a general form of cryptanalysis applicable primarily to block ciphers, but also to stream ciphers and cryptographic hash functions.

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## Eurocrypt

Eurocrypt (or EUROCRYPT) is a conference for cryptography research.

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## John Wiley & Sons

John Wiley & Sons, Inc., also referred to as Wiley, is a global publishing company that specializes in academic publishing and markets its products to professionals and consumers, students and instructors in higher education, and researchers and practitioners in scientific, technical, medical, and scholarly fields.

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## Kaisa Nyberg

Kaisa Nyberg is a cryptographer and computer security researcher, currently a professor at Aalto University School of Science.

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## Key (cryptography)

In cryptography, a key is a piece of information (a parameter) that determines the functional output of a cryptographic algorithm or cipher.

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## Lookup table

In computer science, a lookup table is an array that replaces runtime computation with a simpler array indexing operation.

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## Nothing up my sleeve number

In cryptography, nothing up my sleeve numbers are any numbers which, by their construction, are above suspicion of hidden properties.

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## Permutation box

In cryptography, a permutation box (or P-box) is a method of bit-shuffling used to permute or transpose bits across S-boxes inputs, retaining diffusion while transposing.

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## Portable Document Format

Portable Document Format (PDF) is a file format used to present documents in a manner independent of application software, hardware and operating systems.

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## PostScript

PostScript (PS) is a computer language for creating vector graphics.

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## Queen's University

Queen's University at Kingston (commonly shortened to Queen's University or Queen's) is a public research university located in Kingston, Ontario, Canada.

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## Rijndael S-box

The Rijndael S-box is a matrix (square array of numbers) used in the Rijndael cipher, which the Advanced Encryption Standard (AES) cryptographic algorithm was based on.

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## Selected Areas in Cryptography

Selected Areas in Cryptography (SAC) is an international cryptography conference (originally a workshop) held every August in Canada since 1994.

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## Substitution cipher

In cryptography, a substitution cipher is a method of encoding by which units of plaintext are replaced with ciphertext, according to a fixed system; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth.

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## Symmetric-key algorithm

Symmetric-key algorithms are algorithms for cryptography that use the same cryptographic keys for both encryption of plaintext and decryption of ciphertext.

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## Twofish

In cryptography, Twofish is a symmetric key block cipher with a block size of 128 bits and key sizes up to 256 bits.

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## Redirects here:

Cryptography/s-box, S Box, S box, S-Box, S-boxes, S-table, SBox, Sbox, Substitution box, Substitution boxes.