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Nowadays, the security of information exchange and communication such as authentication, confidentiality, and privacy are essentially important. Cryptographic algorithms are basic components of the security. Encryption algorithms are classified into various types such as block and stream ciphers. In constrained environments and embedded systems such as RFID, lightweight and low cost cryptographic algorithms are required. In June 2013 American National Security Agency (NSA) proposed a new block cipher family named Simon and declared that the aim of Simon design is to fill the gap for secure, flexible, and analyzable and to perform exceptionally well across the full spectrum of lightweight applications. In this paper, we analysis the Simon block cipher family and then simulate and synthesize this algorithm. Implementation results of the Simon cryptography algorithm on a FPGA are presented.

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