RC6 is an iterative secret-key block cipher designed by Rivest et al. [5] in 1998. It has variable parameters such as the key size, the block size, and the number of rounds. A particular (parameterized) RC6 encryption algorithm is designated as RC6 (w, r, b), where w is the word size (one block is made of four words), r is the number of rounds, and b is the number of bytes for the secret key. The three “nominal” choices for the algorithm as submitted to the American {Advanced Encryption Standard} (Rijndael/AES) contest and to the European NESSIE contest are RC6 (32, 20, 16), RC6 (32, 20, 24) and RC6 (32, 20, 32). All three versions have a 128-bit block size, 20 rounds and only differ in the key-size which is respectively 128, 196 and 256 bits long. The secret key is first expanded into an array of \(2r + 4\) secret w-bit words \(S_{ i}\) according to the key scheduling algorithm. Let (A, B, C, D) denote the four w-bit words of the plaintext. Note that a w-bit word is equivalently...
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Handschuh, H. (2005). RC6. In: van Tilborg, H.C.A. (eds) Encyclopedia of Cryptography and Security. Springer, Boston, MA . https://doi.org/10.1007/0-387-23483-7_346
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