Digital signature: quantum chaos approach and bell states

Abstract

The quantum mechanics applied by quantum digital signatures (QDSs) is applied to guarantee the nonrepudiation, unforgeability, and transferability of a signature. Previously, the security of QDSs schemes only depended on the length of the signature. Also, they required unreliable security channels and have been written for one-bit messages. In this paper, quantum digital signature schemes based on bell states sequence and synchronization of coupled chaotic map is introduced. In our schemes, using the synchronization of coupled chaotic map when signing up, security increases against repudiation and forgery. Furthermore, to sign a regular message, repeating the signature steps is half as much as the previous ones.