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CTRSA
2007
Springer

Differential Power Analysis of Stream Ciphers

13 years 9 months ago
Differential Power Analysis of Stream Ciphers
Side-channel attacks on block ciphers and public key algorithms have been discussed extensively. However, there is only sparse literature about side-cannel attacks on stream ciphers. The few existing references mainly treat timing [8] and template attacks [10], or provide a theoretical analysis [6], [7] of weaknesses of stream cipher constructions. In this paper we present attacks on two focus candidates, Trivium and Grain, of the eSTREAM stream cipher project. The attacks exploit the resynchronization phase of ciphers. A novel concept for choosing initial value vectors is introduced, which totally eliminates the algorithmic noise of the device, leaving only the pure side-channel signal. This attack allows to recover the secret key with a small number of samples and without building templates. To prove the concept we apply the attack to hardware implementations of the ciphers. For both stream ciphers we are able to reveal the complete key.
Wieland Fischer, Berndt M. Gammel, O. Kniffler, J.
Added 14 Aug 2010
Updated 14 Aug 2010
Type Conference
Year 2007
Where CTRSA
Authors Wieland Fischer, Berndt M. Gammel, O. Kniffler, J. Velten
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