شماره ركورد كنفرانس :
4058
عنوان مقاله :
Modified Fixed Point Attack on Gost2
پديدآورندگان :
Ahmadi Siavash s_ahmadi@ee.sharif.edu Information Systems and Security Lab (ISSL), Department of Electrical Engineering, Sharif University of Technology , Aref Mohammad Reza aref@sharif.edu Information Systems and Security Lab (ISSL), Department of Electrical Engineering, Sharif University of Technology
كليدواژه :
Cryptanalysis , Fixed Point Attack , Gost Block Cipher
عنوان كنفرانس :
چهاردهمين كنفرانس بين المللي انجمن رمز ايران
چكيده فارسي :
One of the well known block ciphers is Gost which
was accepted as a Russian Standard, and was proposed to
be included in ISO/IEC 18033-3. But, recent attacks on this
cipher result in extracting more weaknesses of it and so the
standardization of Gost was rejected. In 2015, the designers
proposed a modified version of Gost, namely Gost2, which has a
new key schedule and explicit choice for Sboxes. In this paper,
we present a modified algorithm for fixed point attack on Gost2
with computational complexity of 2230:2. This computational
complexity has a factor of 26:8 improvement with the cost of
increasing memory complexity in comparison to previous attack
which has 2237 computational complexity
