| 词条 | ORYX (encryption algorithm) |
| 释义 |
Algorithm descriptionORYX is a simple stream cipher based on binary linear-feedback shift registers (LFSRs) to protect cellular data transmissions (for wireless data services). The cipher ORYX has four components: three 32-bit LFSRs which labeled as LFSRA, LFSRB and LFSRK, and an S-box containing a known permutation P of the integer values 0 to 255. The feedback function for LFSRK is defined as: Lt + 32 = Lt + 28 ⊕ Lt + 19 ⊕ Lt + 18 ⊕ Lt + 16 ⊕ Lt + 14 ⊕ Lt + 11 ⊕ Lt + 10 ⊕ Lt + 9 ⊕ Lt + 6 ⊕ Lt + 5 ⊕ Lt + 1 ⊕ Lt The feedback functions for LFSRA are defined as: Lt + 32 = Lt + 26 ⊕ Lt + 23 ⊕ Lt + 22 ⊕ Lt + 16 ⊕ Lt + 12 ⊕ Lt + 11 ⊕ Lt + 10 ⊕ Lt + 8 ⊕ Lt + 7 ⊕ Lt + 5 ⊕ Lt + 4 ⊕ Lt + 2 ⊕ Lt + 1 ⊕ Lt and Lt + 32 = Lt + 27 ⊕ Lt + 26 ⊕ Lt + 25 ⊕ Lt + 24 ⊕ Lt + 23 ⊕ Lt + 22 ⊕ Lt + 17 ⊕ Lt + 13 ⊕ Lt + 11 ⊕ Lt + 10 ⊕ Lt + 9 ⊕ Lt + 8 ⊕ Lt + 7 ⊕ Lt + 2 ⊕ Lt + 1 ⊕ Lt The feedback function for LFSRB is: Lt + 32 = Lt + 31 ⊕ Lt + 21 ⊕ Lt + 20 ⊕ Lt + 16 ⊕ Lt + 15 ⊕ Lt + 6 ⊕ Lt + 3 ⊕ Lt + 1 ⊕ Lt See also
Notes1. ^[D. Wagner, L. Simpson, E. Dawson, J. Kelsey, W. Millan, and B. Schneier http://www.schneier.com/paper-oryx.pdf "Cryptanalysis of ORYX"], Fifth Annual Workshop on Selected Areas in Cryptography, Springer Verlag, August 1998, to appear. External links
1 : Stream ciphers |
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