<span>Nowadays, cryptography especially hash functions require to move from classical paradigms to an original concept able to handle security issues and new hardware architecture challenges as in distributed systems. In fact, most of current hash functions apply the same design pattern that was proved vulnerable against security threats; hence the impact of a potential weakness can be costly. Thus, the solution begins with a deep analysis of divers attack strategies; this way can lead to finding a new approach that enables new innovative and reliable candidates as alternative hash functions. So to achieve this goal, in this article we introduce a new construction design that consists of a non-iterative behavior by combining a parallel block processing and a sequential xor addition process, in order to provide a secure design without changing the expected goal of a hash function, at the same time avoid the use of vulnerable structures.</span>

The communication of private information is very dangerous, since unauthorized entities can intercept it. Thus, encryption is one of the principal information security solutions that helps keep information confidentiality. This latter can be satisfied by the use of various encryption techniques, namely block cipher. In this paper, the authors propose a novel block cipher using reversible and irreversible one-dimensional cellular automata (CA) with an ant colony optimization (ACO)-based S-box in order to establish more confusion. The obtained experimental results confirm that the designed cipher resists against statistical attacks, and it has both good confusion and diffusion comparing to the existent classical symmetric cryptosystems.

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