Analysis and design of stream ciphers
Analysis and design of stream ciphers
On functions of linear shift register sequences
Proc. of a workshop on the theory and application of cryptographic techniques on Advances in cryptology---EUROCRYPT '85
Products of linear recurring sequences with maximum complexity
IEEE Transactions on Information Theory
Fast correlation attacks on certain stream ciphers
Journal of Cryptology
Fast Correlation Attacks Based on Turbo Code Techniques
CRYPTO '99 Proceedings of the 19th Annual International Cryptology Conference on Advances in Cryptology
Cryptanalysis of LFSR-Encrypted Codes with Unknown Combining Function
ASIACRYPT '99 Proceedings of the International Conference on the Theory and Applications of Cryptology and Information Security: Advances in Cryptology
Decrypting a Class of Stream Ciphers Using Ciphertext Only
IEEE Transactions on Computers
Improved fast correlation attacks on stream ciphers via convolutional codes
EUROCRYPT'99 Proceedings of the 17th international conference on Theory and application of cryptographic techniques
Improved fast correlation attacks using parity-check equations of weight 4 and 5
EUROCRYPT'00 Proceedings of the 19th international conference on Theory and application of cryptographic techniques
Cryptanalysis of Stream Ciphers with Linear Masking
CRYPTO '02 Proceedings of the 22nd Annual International Cryptology Conference on Advances in Cryptology
Characteristic set algorithms for equation solving in finite fields
Journal of Symbolic Computation
Correlation attacks on combination generators
Cryptography and Communications
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This paper presents an operational reconstruction technique of most stream ciphers. We primarily expose it for key-stream generators which consist of several linear feedback shift registers combined by a nonlinear Boolean function. It is shown how to completely recover the different feedback polynomials and the combining function, when the algorithm is totally unknown. This attack only requires the knowledge of some ciphertexts, which may be generated from different secret keys. Estimates of necessary ciphertext length and experimental results are detailed.