This paper describes new methods for fast correlation attacks on stream ciphers, based on techniques used for constructing and decoding the by now famous turbo codes. The proposed algorithm consists of two parts, a preprocessing part and a decoding part. The preprocessing part identifies several parallel convolutional codes, embedded in the code generated by the LFSR, all sharing the same information bits. The decoding part then finds the correct information bits through an iterative decoding procedure. This provides the initial state of the LFSR.
|Title of host publication||Advances in Cryptology / Lecture Notes in Computer Science|
|Publication status||Published - 1999|
|Event||19th Annual International Cryptology Conference CRYPTO’ 99 - Santa Barbara, California|
Duration: 1999 Aug 15 → 1999 Aug 19
|Conference||19th Annual International Cryptology Conference CRYPTO’ 99|
|Period||1999/08/15 → 1999/08/19|