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Comparison of Switching Stream Cipher Systems
, M.Sc. Thesis Sharif University of Technology ; Daneshgar, Amir (Supervisor)
Abstract
In this thesis, we analyze and compare switching and CPSP cryptography systems. CPSP is a dynamic system which can act as synchronized or self-synchronized stream cipher under specific conditions. To do the comparison, first we have a brief review of cryptography fundamentals like stream cipher systems, synchronized stream ciphers, and self-synchronized ones. Then, we consider chaos systems in general form and then we present their role in cryptography systems, and in continue by introducing switching cryptography systems and also CPSP cryptography systems, and analyzing their relation with self-synchronized stream ciphers, we do our statistical tests on them
A secure self-synchronized stream cipher
, Article Computer Journal ; Volume 61, Issue 8 , August , 2018 , Pages 1182-1201 ; 00104620 (ISSN) ; Mohebbipoor, F ; Sharif University of Technology
Oxford University Press
2018
Abstract
We follow two main objectives in this article. On the one hand, we introduce a security model called LORBACPA+ for self-synchronized stream ciphers which is stronger than the blockwise LOR-IND-CPA, where we show that standard constructions as delayed CBC or similar existing self-synchronized modes of operation are not secure in this stronger model. Then, on the other hand, following contributions of Millérioux et al., we introduce a new self-synchronized stream cipher and prove its security in LORBACPA+ model. © The British Computer Society 2018. All rights reserved
Self-synchronizing Stream Ciphers and Multimedia Encryption
, M.Sc. Thesis Sharif University of Technology ; Daneshgar, Amir (Supervisor)
Abstract
The purpose of this dissertation is to investigate encryption of multimedia files using self-synchronizing stream ciphers. First, we will briefly examine various features of self-synchronizing stream ciphers, where we also review some self-synchronizing stream cipher design techniques. In particular, we study the system $ \mathbf{S}_{\sigma} ^ 4 $ (Daneshgar and Mohebbipour, $ 2018 $), which is designed using unknown input observer techniques. In Chapter~3, compression algorithms for $ JPEG $ and $ MPEG $ are discussed in detail. Finally, in Chapter~4, we briefly study some multimedia encryption algorithms that are used for $ JPEG $ and $ MPEG $ compression algorithms. The results of using...