KN-Cipher
From Wikipedia, the free encyclopedia
| KN-Cipher | |
| General | |
|---|---|
| Designers | Kaisa Nyberg and Lars Knudsen |
| First published | 1995 |
| Cipher detail | |
| Key sizes | 198 bits |
| Block sizes | 64 bits |
| Structure | Feistel network |
| Rounds | 6 |
| Best public cryptanalysis | |
|
Jakobsen & Knudsen's higher order differential cryptanalysis breaks KN-Cipher with only 512 chosen plaintexts and 241 running time, or with 32 chosen plaintexts and 270 running time.
|
|
In cryptography, KN-Cipher is a block cipher created by Kaisa Nyberg and Lars Knudsen in 1995. One of the first ciphers designed to be provably secure against ordinary differential cryptanalysis, KN-Cipher was later broken using higher order differential cryptanalysis.
Presented as "a prototype...compatible with DES", the algorithm has a 64-bit block size and a 6-round Feistel network structure. The round function is based on the cube operation in the finite field GF(233).
The designers didn't specify any key schedule for the cipher; they state, "All round keys should be independent, therefore we need at least 198 key bits."
[edit] References
- K. Nyberg, L.R. Knudsen (1995). "Provable Security Against a Differential Attack" (PDF/PostScript). Journal of Cryptology 8 (1): pp.27–37. ISSN 0933-2790.
- T. Jakobsen, L.R. Knudsen (January 1997). "The Interpolation Attack on Block Ciphers" (PDF/PostScript). 4th International Workshop on Fast Software Encryption (FSE '97): pp.28–40, Haifa: Springer-Verlag. Retrieved on 2007-01-23.
 |
This cryptography-related article is a stub. You can help Wikipedia by expanding it. |
