پديد آورنده :
سجاديه، مهدي
عنوان :
شيوه هاي طراحي تبديل انتشار در رمزهاي قالبي نوين
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
محمد دخيل عليان
استاد مشاور :
بهناز عمومي، حميد ملا
توصيفگر ها :
ماتريس هاي واندرموند
تاريخ نمايه سازي :
17/11/91
استاد داور :
محمود سلماسي زاده، بابك صادقيان، محمود مدرس هاشمي
دانشكده :
مهندسي برق و كامپيوتر
كد ايرانداك :
ID472 دكتري
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Methods for Design of Diffusion Layers in Modern Block Ciphers Mahdi Sajadieh sadjadieh@ec iut ac ir July 15 2012 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Supervisor Mohammad Dakhilalian mdalian@cc iut ac ir Advisor Behnaz Omoomi Advisor Dr Hamid Mala Department Graduate Program Coordinator Masoud Omoomi Isfahan University of Technology Iran Isfahan University Iran Abstract Modern block ciphers are cascades of several rounds and each round consists of confusion and diffusion layers In many block ciphers non linear substitution boxes S boxes form the confusion layer and a linear transformation provides the required diffusion The diffusion layer plays an efficacious role in providing resistance against the most well known attacks on block ciphers such as differential cryptanalysis DC and linear cryptanalysis In this thesis first we propose a new involutory construction for diffusion layer where be replaced in the diffusion layer of the block cipher Hierocrypt to increase their performance without decrease of security The new diffusion layer are based on the invertibility of some simple linear functions in GF 2 According to the new method recursive diffusion layers are designed and these properties are studied In the last the method is proposed that makes an involutory MDS matrix from the Vandermonde matrices Then we propose another method for the construction of 2n 2n Hadamard MDS matrices in the finite field GF 2q In addition to introduce this method we present a direct method for the inversion of a special class of 2n 2n Vandermonde matrices that named SV matrices Key words Block cipher Diffusion layer Branch number MDS matrix
استاد راهنما :
محمد دخيل عليان
استاد مشاور :
بهناز عمومي، حميد ملا
استاد داور :
محمود سلماسي زاده، بابك صادقيان، محمود مدرس هاشمي
