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GRAIN-v1 is a stream cipher that has been selected in the final portfolio of the eSTREAM project. GRAIN-128 is a variant of GRAIN-v1. The best known mathematical attack against GRAIN-128 is the brute force key-search. This paper introduces a fault attack on GRAIN-128 based on a realistic fault model and explores possible improvements of the attack. We also discuss countermeasures to counteract our...
In this paper we introduce a new probabilistic lattice-based bounded homomorphic encryption scheme. For this scheme the sum of two encrypted messages is the encryption of the sum of two messages and the scheme is able to preserve a vector spave structure of the message. The size of the public key is rather large ap 3 Mb but the encryption and the decryption operations are very fast (of the same speed...
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