Abstract-The modified Dӧmӧsi's cryptosystem [1] is a stream cipher based on deterministic finite automata without outputs for encoding and decoding. This cryptosystem uses an additional control system to improve the performance to a better linear time without backtracking. This paper, we propose a nondeterministic variant of the cryptosystem, which allows to reduce the dependency of the key automata on a large size and on reversibility of automata.
The performance and security have central importance of cryptography field. Therefore, theneed to use block ciphers are become very important. This paper presents a new block cipher based on finiteautomata system. The proposed cryptosystem is executed based on parallel computations to reduce thedelay time. Moreover, to achieve high security, we use different machines (variant non-deterministicautomata accepters) as keys for encryption and decryption.
The performance has a central importance for all cryptosystems. This paper aims to provide aframework and platform to evaluate a performance of Modified Dӧmӧsi’s Cryptosystem, a stream cipherbased on finite automata, comparing to Data Encryption Standard. The performance is evaluated in termsof encrypting time and throughput.
A new symmetric cryptosystem based on permutation matrices is proposed. In this paper, the encryption and decryptionalgorithms were built upon random multiple selection of the elements in the permutation matrix. This technique promotes theconfusion, diffusion, and increases the complexity of proposed algorithms. The security and performance of the proposedcryptosystem is evaluated.
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