Objectives:Currently, NFC leads the mobile payment market. In such a situation, leakage and change of payment information and leakage of personal information by cracking can cause serious social problem. Accordingly, the coding technique used for security of NFC should be safer than now. Methods/Statistical Analysis:Though AES currently used in security of NSF is a safe coding technique, it is not equipped with certifying function. Thus, this paper, by combining AES with Modification Detection

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... ode and Message Authentication Code, suggests an encryption algorithm with authentication function. Findings:To strengthen authentication function and integrity function, the new symmetric encryption algorithm was designed not to predictable relation and input-output relations of hash function. By simultaneously using Message Authentication Code and Modification Detection Code where blocked hand-shake method is applied, it is encryption algorithm suitable to the NFC environment.The encryption algorithm suggested in the paper generates hash values corresponding to Modification Detection Code and Message Authentication Code, along with the RD-I and RD-II part and the encryption part. Such hash values perform authentication functions using only output of the suggested algorithm without securing a separate authentication channel. Improvements/Applications:The suggested encryption algorithm combines existing Message Authentication Code and Modification Detection Code to use them for authentication. Consequently, it will guarantee authentication and encryption functions by securing a safer NFC communication channel.