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المستخلص
Based on the principles of both classical and quantum computations primitives, a new symmetric key quantum cryptographic algorithm that can be used to encrypt classical binary message as well as quantum infonnation is proposed.
Encryption and decryption are implemented by the aid of classical and quantum computation which can be realized by suitable technology. Because each encryption process is under the control of the key which is dynamically and recursively changed through each round in both encryption and decryption and the fmal ciphertext states are non-orthogonal, the eavesdropper can not acquire fixed ciphertext without the keys, so the eavesdropping attack is invalid, which is guaranteed with the no-cloning theory in quantum mechanics. Similarly, the non-orthogonality of the ciphertext renders the Trojan horse attack strategy impossible.
Also the algorithm applies a pseudo random process from stage to stage. This pseudo randomness hinders the ability of Eve to attack such a scheme. It is shown that the algorithm has perfect secrecy and its security is analyzed from several aspects. It is shown that the quantum block cryptographic algorithm, in which the key is dynamically changed from round to round, can prevent quantum as well as classical attacks strategy.