شماره ركورد كنفرانس :
4058
عنوان مقاله :
A New Approach to Key Schedule Designing
پديدآورندگان :
Hoseini Najarkolaei Seyed Reza hoseini@ee.sharif.edu Information Systems and Security Lab (ISSL) Department of Electrical Engineering Sharif University of Technology , 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 :
Permutation graph , key schedule , diffusion , block cipher.
عنوان كنفرانس :
چهاردهمين كنفرانس بين المللي انجمن رمز ايران
چكيده فارسي :
Diffusion of key schedule algorithm plays an important
role in security of block ciphers. In this paper, we present a new
approach to key schedule diffusion analysis by taking the
advantages of graph theory modeling. This modeling can help to
disclose the weaknesses of key schedules. In this line, the key
schedule weaknesses of Twine-128 are shown and an improved key
schedule is proposed. In order to make a fair comparison, some
parameters are introduced to quantify the diffusion property of
key schedule, and compare the results for Twine-128 with both key
schedules. The results show that the new key schedule made
Twine-128 stronger. Also for more reliability, the results of
biclique attack on Twine-128 with both key schedules are
compared and the significances of the new one are illustrated.
