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In this paper, the authors propose an improved block cipher symmetric encryption algorithm that has the same structure of encryption and decryption. So far, conventional cryptography algorithms have difference structure of encryption and decryption. They devise their algorithm by inserting a symmetric layer using random number, encryption number and XOR operations, in which the whole proposed algorithm rounds uses encryption procedure and the same for it decryption procedure. The symmetry layer is put between encryption part and decryption one. The proposed algorithm has the batter speed compared with the comparing encryption algorithm. Nevertheless, the proposed algorithm improves encryption security by inserting the symmetric layer.
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