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Plaintext and key are independent in the existing block cipher. Also, encryption/decryption is performed by using structural features. Therefore, the external environment of suggested mixed cryptographic algorithm is identical with the existing ones, but internally, features of the existing block cipher were meant to be removed by making plaintext and key into dependent functions. Also, to decrease the loads on the authentication process, authentication add-on with dependent characteristic was included to increase the use of symmetric cryptographic algorithm. Through the simulation where the proposed cryptosystem was implemented in the chip level, we show that our system using the shorter key length than the length of the plaintext is two times faster than the existing systems.

A Study on the design of mixed block crypto-system using subordinate relationship of plaintext and key