Codes and cryptography
Fast correlation attacks on certain stream ciphers
Journal of Cryptology
Elements of information theory
Elements of information theory
Error Correction Coding: Mathematical Methods and Algorithms
Error Correction Coding: Mathematical Methods and Algorithms
Decrypting a Class of Stream Ciphers Using Ciphertext Only
IEEE Transactions on Computers
Physical-layer security: combining error control coding and cryptography
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Theoretical analysis of a correlation attack based on convolutional codes
IEEE Transactions on Information Theory
Extrinsic information transfer functions: model and erasure channel properties
IEEE Transactions on Information Theory
Applications of LDPC Codes to the Wiretap Channel
IEEE Transactions on Information Theory
Wireless Information-Theoretic Security
IEEE Transactions on Information Theory
LDPC codes for physical layer security
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
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Traditional cryptography assumes an eavesdropper receives an error-free copy of the transmitted ciphertext. Wyner's wiretap channel model recognizes that at the physical layer both the intended receiver and the passive eavesdropper inevitably receive an error-prone version of the transmitted message which must be corrected prior to decryption. This paper considers the implications of using both channel and cryptographic codes under the wiretap channel model in a way that enhances the information-theoretic security for the friendly parties by keeping the information transfer to the eavesdropper small. We consider a secret-key cryptographic system with a linear feedback shift register (LFSR)-based keystream generator and observe the mutual information between an LFSR-generated sequence and the received noise-corrupted ciphertext sequence under a known-plaintext scenario. The effectiveness of a noniterative fast correlation attack, which reduces the search time in a brute-force attack, is shown to be correlated with this mutual information. For an iterative fast correlation attack on this cryptographic system, it is shown that an EXIT chart and mutual information are very good predictors of decoding success and failure by a passive eavesdropper.