Fast correlation attacks based on turbo code techniques

Summary, in English

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.

• Author: Thomas Johansson; Fredrik Jönsson
• Department/s: Department of Electrical and Information Technology
• Publishing year: 1999
• Language: English
• Pages: 181-197
• Publication/Series: Advances in Cryptology / Lecture Notes in Computer Science
• Volume: 1666
• Links: http://dx.doi.org/10.1007/3-540-48405-1_12
• Document type: Conference paper
• Publisher: Springer
• Topic: Electrical Engineering, Electronic Engineering, Information Engineering
• Conference name: 19th Annual International Cryptology Conference CRYPTO’ 99
• Conference date: 1999-08-15 - 1999-08-19
• Status: Published
• ISBN/ISSN/Other: ISSN: 1611-3349; ISSN: 0302-9743; ISBN: 978-3-540-66347-8