In many authentication and encryption systems, the encryption algorithm of the system is fixed. These systems are not designed to renew the encryption algorithm of the system. Therefore in these systems, it takes much time and money to change the encryption algorithm of the system and all plaintexts have to be encrypted with the fixed encryption algorithm. In this paper, we propose a renewable authentication and encryption system and the renewal protocol. In the proposed system, an encryption algorithm can be used according to the value of a plaintext. The system can renew the encryption algorithm of the system securely and efficiently through computer networks in order to improve the security level of the system.
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