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Based on a quantum shift register, a novel quantum block cryptographic algorithmthat can be used to encrypt classical messages is proposed. The message is encoded and decodedby using a code generated by the quantum shift register. The security of this algorithm isanalysed in detail. It is shown that, in the quantum block cryptographic algorithm, two keyscan be used. One of them is the classical key that is used in the Hill cipher algorithm whereAlice and Bob use the authenticated Diffie Hellman key exchange algorithm using the conceptof digital signature for the authentication of the two communicating parties and so eliminatethe man-in-the-middle attack. The other key is generated by the quantum shift register andused for the coding of the encryption message, where Alice and Bob share the key by usingthe BB84 protocol. The novel algorithm can prevent a quantum attack strategy as well asa classical attack strategy. The problem of key management is discussed and circuits for theencryption and the decryption are suggested

Novel Quantum Encryption Algorithm Based on Multiqubit Quantum Shift Register and Hill Cipher