الفهرس 
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Abstract
Quantum information processing is a new and dynamic research field. It focuses on the consequences of encoding digital bits on macroscopic objects such as photons. Most importantly, it exploits the fact that, according to quantum physics principles, the mere observing of a quantum object perturbs it in an irreparable way. Thus, eavesdropping over the communication channel can be easily detected. Based on the principles of both classical computation and quantum computation, a new symmetric key quantum encryption algorithm is proposed. The proposed scheme proceeds in five steps, where the first two stages manipulate the classical message bits and the remaining steps manipulate equivalent qubits. The message is divided into blocks of 16-bits. Since each message block encryption process is under the control of a key, which dynamically and recursively changes through each round in both encryption and decryption, and the final cipher text states are non-orthogonal, the eavesdropper cannot acquire any useful information from a given cipher text without the key. Similary, the non-orthogonality of the cipher text renders the Trojan horse attack strategy impossible.