Abstract:

Through security analysis the receiver can realize existential forgery of the signers signature under known-plaintext attack. And a new efficient arbitrated quantum signature (AQS) scheme is introduced in which the signer sends the each Einstein-Padolsky-Rosen (EPR) pairs to the signer and the receiver. The signer measures the entanglement photons, and the receiver recovers the encrypted quantum message with the received particle and the measurement. By comparing the recovery quantum message with original message, it can ensure the integrity of the signature. In signing phrase, the signer uses new encrypted method to sign the quantum message with the variable, that guarantees the receiver and the signer cannot disavow the signature. The new scheme combines a special quantum gate operation with quantum one-time pads, and it guarantees the receiver cannot use known-plaintext attack and forge the signature.

Key words: arbitrated quantum signature, known-plaintext attack, quantum logic gate