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Abstract

With the recent increase in the risks and attacks facing our dailylives and digital environment around us,the trend towards securing data has become inevitable. Block ciphers play a crucial role in modern crypto-applications such assecure network storageandsignatures and are used to safeguard sensitive information. The present paper develops a new variant of the symmetric model called SUMER family ciphers with three equivalent modes:lightweight, conventional (traditional), and extended ciphers. SUMER name belongs to one of the oldest civilizationsin Mesopotamia andstands for SecureUniversalModel of EncryptionRobustCipher. The SUMER cipher is based on a simple and robust symmetric structure and involves solid algebraic theories that completely depend on the Galois Field GF(28). SUMER cipher is designed to work with two involutional structures of the Substitution-Permutation Network (SPN) and Feistel structure. These two involutional structures mean that the same algorithm is used for the encryption and decryption process, and onlythe algorithm of the ciphering key is used in reverse order in both structures. The SUMER lightweight structure is an elegant mode that does not need buildinganS-Box thatrequires a large amount of memory and a number of electronic logical gates asS-Box construction has been canceled and replaced by the on-fly computation clue,whichdoes not need a reserved memory for building S-Box. SUMER family ciphers also can work in a traditional mode or as an extended mode with highmargin security. This family of ciphers isapplicable with multi-modes of various utilizations. The proposed ciphers are designed to be byte-oriented,showinggood evaluation and results under several measurement tests forspeed, time implementation,and efficiency.

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