S-Box: Cryptography, Symmetric-Key Algorithm, Block Cipher, Ciphertext, Claude Shannon, Confusion and Diffusion, Bit, Twofish, Key, Bruce Schneier, International Data Encryption Algorithm - Brossura

Brossura

ISBN 10: 6130350945 ISBN 13: 9786130350949

Casa editrice: Betascript Publishing, 2010

Riassunto

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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 many cases, the S-Boxes are carefully chosen to resist cryptanalysis. In general, an S-Box takes some number of input bits, m, and transforms them into some number of output bits, n: 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.

Dettagli dell'edizione

• Editore: Betascript Publishing
• Data di pubblicazione: 2010
• Lingua: Inglese
• ISBN 10: 6130350945
• ISBN 13: 9786130350949
• Rilegatura: Copertina flessibile
• Numero di pagine: 68
• Redattore: Surhone Lambert M., Tennoe Mariam T., Henssonow Susan F.
• Contatto del produttore: non disponibile
• Persona responsabile: non disponibile