Analysis and design of stream ciphers
Analysis and design of stream ciphers
Pseudorandom Bit Generators in Stream-Cipher Cryptography
Computer - Special issue on cryptography
CRYPTO '93 Proceedings of the 13th annual international cryptology conference on Advances in cryptology
Handbook of Applied Cryptography
Handbook of Applied Cryptography
Shift Register Sequences
Bluetooth Security
Cryptanalysis of alleged A5 stream cipher
EUROCRYPT'97 Proceedings of the 16th annual international conference on Theory and application of cryptographic techniques
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This paper presents a novel keystream generator using pseudorandom binary sequences (PRBS) with irregular clocking that is based on the A5/1 stream cipher which is used to secure GSM conversations. An improvement in security is obtained by introducing dynamic polynomial switching in the Linear Feedback Shift Registers (LFSRs) present in the architecture for pseudo noise sequence generation. A basic security analysis shows that this introduction increases the stream cipher's resistance to cryptanalysis. Statistical tests are applied to the keystream in compliance with the National Institute of Standards and Technology (NIST) and Diehard test suites in order to ensure the quality of bitstream produced by the generator.