A Secure Self-synchronized Stream Cipher

2017/09/25 by Daneshgar, Amir, Mohebbipoor, Fahimeh
#Cryptography and Security (cs.CR) #FOS: Computer and information sciences

paper · doi:10.48550/arxiv.1709.08613

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 G.~Millérioux et.al., we introduce a new self-synchronized stream cipher and prove its security in LORBACPA⁺ model.

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