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۱Algebraic Cryptanalysis of Reduced AES
نویسنده(ها): ،
اطلاعات انتشار: ششمین کنفرانس انجمن رمز ایران، سال
تعداد صفحات: ۴
Algebraic attack on AES was proposed, recently. It was called XSL attack. The suggested computational complexity of this attack on AES is in theory polynomial in the number of rounds. So the computational complexity of the attack does not reduce significantly by decreasing the number of rounds. Therefore the implementation of attack is not practical even for the low number of AES round. In addition, the estimate given for the number of linearly independent equations generated by XSL technique is not proved exactly and it can not be checked even for reduced AES, because the mentioned reason. But there is a question: weather it may be possible to have another equation system expressing the AES that enable the algebraic attack on reduced AES with computational complexity lower than exhaustive search attack. In this paper a new equation system for AES is proposed that results in new algebraic attack on reduced AES up to 5 rounds. Solving this equation system even by worst method like guessing the unknowns is faster than the brute force attack.<\div>

۲improvement on Q.Xie threshold proxy signature scheme against collusion attack
نویسنده(ها): ، ، ،
اطلاعات انتشار: نوزدهمین کنفرانس مهندسی برق ایران، سال
تعداد صفحات: ۵
In a t,n threshold proxy signature scheme the original signer can delegate the signing power \to n proxy singners such that any t or more out of n proxy singners can sign messages on behalf of the original signer but t –1 or less of the proxy signers cannot generate a proxy signature in this paper we will improve the security of xie's threshold proxy signature scheme against the new types of collusion attack was presented by liu and tan in 2007 we also present that our improved scheme is more efficient than xie's scheme in terms of computational complexities.<\div>
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