Cryptology ePrint Archive: Report 2020/327

On the design of stream ciphers with Cellular Automata having radius = 2

Anita John and Rohit Lakra and Jimmy Jose

Abstract: Cellular Automata (CA) have recently evolved as a good cryptographic primitive. It plays an important role in the construction of new fast, efficient and secure stream ciphers. Several studies have been made on CA based stream ciphers and we observe that the cryptographic strength of a CA based stream cipher increases with the increase in the neighbourhood radii if appropriate CA rules are employed. The current work explores the cryptographic feasibility of 5-neighbourhood CA rules also referred to as pentavalent rules. A new CA based stream cipher, CARPenter, which uses pentavalent rules have been proposed. The cipher incorporates maximum length null-boundary linear CA and a non-linear CA along with a good non-linear mixing function. This is implemented in hardware as well as software and exhibits good cryptographic properties which makes the cipher resistant to almost all attacks on stream ciphers, but with the cost of additional computing requirements. This cipher uses 16 cycles for initialization, which is the least number of cycles when compared to other existing stream ciphers.

Category / Keywords: secret-key cryptography / Stream Ciphers Cellular Automata 5-neighborhood CA Grain

Date: received 16 Mar 2020

Contact author: anita_p170007cs at nitc ac in

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Version: 20200317:183510 (All versions of this report)

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