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In this paper, a block-cipher, Integrated Encryption System (IES), to be implemented in bit-level is presented that requires a 252-bit secret key. In IES, there exist at most sixteen rounds to be implemented in cascaded manner. RPSP, TE, RPPO, RPMS, RSBM, RSBP are the six independent block-ciphering protocols, that are integrated to formulate IES. A round is constituted by implementing one of the protocols on the output produced in the preceding round. The process of encryption is an interactive activity, in which the encryption authority is given enough scope of flexibility regarding choice of protocols in any round. However no protocol can be used in more than three rounds.
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