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• S-box abstract "In cryptography, an S-box (substitution-box) is a basic component of symmetric key algorithms which performs substitution. In block ciphers, they are typically used to obscure the relationship between the key and the ciphertext — Shannon's property of confusion.In general, an S-box takes some number of input bits, m, and transforms them into some number of output bits, n, where n is not necessarily equal to m. An m×n S-box can be implemented as a lookup table with 2m words of n bits each. Fixed tables are normally used, as in the Data Encryption Standard (DES), but in some ciphers the tables are generated dynamically from the key (e.g. the Blowfish and the Twofish encryption algorithms).[citation needed]One good example of a fixed table is this 6×4-bit S-box from DES (S5):Given a 6-bit input, the 4-bit output is found by selecting the row using the outer two bits (the first and last bits), and the column using the inner four bits. For example, an input "011011" has outer bits "01" and inner bits "1101"; the corresponding output would be "1001".The 8 S-boxes of DES were the subject of intense study for many years out of a concern that a backdoor — a vulnerability known only to its designers — might have been planted in the cipher. The S-box design criteria were eventually published (in Coppersmith 1994) after the public rediscovery of differential cryptanalysis, showing that they had been carefully tuned to increase resistance against this specific attack. Biham and Shamir found that even small modifications to an S-box could significantly weaken DES.There has been a great deal of research into the design of good S-boxes, and much more is understood about their use in block ciphers than when DES was released.[citation needed]Any S-box where each output bit is produced by a bent function of the input bits, and where any linear combination of the output bits is also a bent function of the input bits, is a perfect S-box.".
• S-box wikiPageExternalLink summary?doi=10.1.1.40.7715.
• S-box wikiPageExternalLink rd.383.0243.
• S-box wikiPageExternalLink SBOXDESN.HTM.
• S-box wikiPageExternalLink co4513.htm.
• S-box wikiPageID "240991".
• S-box wikiPageRevisionID "594399359".
• S-box hasPhotoCollection S-box.
• S-box subject Category:Symmetric-key_cryptography.
• S-box comment "In cryptography, an S-box (substitution-box) is a basic component of symmetric key algorithms which performs substitution. In block ciphers, they are typically used to obscure the relationship between the key and the ciphertext — Shannon's property of confusion.In general, an S-box takes some number of input bits, m, and transforms them into some number of output bits, n, where n is not necessarily equal to m. An m×n S-box can be implemented as a lookup table with 2m words of n bits each.".
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