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This paper presents a new way of constructing binary cascade clock-controlled LFSR sequence generators as building blocks for stream ciphers. In these constructions the bottleneck of multiple clocking shift registers is removed, resulting in so called jump-controlled sequence generators, that operate in a single clock pulse and are most efficient to(More)
Jumping LFSRs have recently been proposed [SASC04] as building blocks for stream ciphers. In this paper a construction based on these principles is described. The proposed encryption primitive is the key stream generator part of a synchronous stream cipher accommodating a key of 128 bits and an IV of 64 up till 112 bits. A number of cryptanalytic attacks(More)
Jump registers were recently proposed [SASC04] as building blocks for stream ciphers. In this paper a construction based on these principles is described. The proposed encryption primitive is a synchronous stream cipher accommodating a key of 128 bits and an IV of 64 up to 162 bits, or an 80-bit key and 32 to 108 bit IV. Version 3 comes as a final(More)
Recently two attacks on the Pomaranch stream cipher have been described pointing to two weaknesses in the original design, namely the IV initialization procedure, and the characteristic polynomial used in the jump registers. The latter weakness has already been repaired as described in a previous note by the authors [1]. In this note we provide a simple(More)