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Grain-v1 is an 80-bit hardware oriented stream ciphers that has been selected for the final portfolio of eSTREAM project. It has been proved experimentally that an algebraic attack can be devised against Grain-v1 which can recover almost half of its 160 internal state bits within limited resources. This attack is possible because of the algebraic structure of the equations relating the internal state...
Cryptanalysis is also a tool to measure the strength of a cipher in terms of its resistance against different types of attacks. Every new proposed design ensures at least that it is resistant to the existing attacks. Algebraic attack is now quite a familiar threat for stream ciphers. Moreover, to make out the design components that can strengthen a cipher against algebraic cryptanalysis must also...
Among recent developments on stream ciphers, the algebraic attack has gained much attention. In this paper we concentrate on algebraic cryptanalysis of Grain, a non-linear feedback shift register (NLFSR) based stream cipher. The target here is to analyze generic key generating structure of Grain, that is why, we aim to recover the internal states of cipher rather than the key-bits. Experiments are...
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