A novel single agent quantum bit commitment scheme

Quantum cryptography is believed to be unbreakable in theory because of the laws of quantum mechanics. Numerous experiments have demonstrated the feasibility of quantum cryptography and a complete proof of the unconditional security of some main schemes. However, in practice all devices need trusting by each other firstly during the process of quantum key distribution(QKD). For identifying the reliability, we propose a quantum bit commitment protocol that can be regarded as the primitive of authentication protocol in QKD networks. In this protocol we complete bit commitment merely by one agent, and prove the security of the schemes. Compared with other protocols, our schemes have less requirement for additional hardware and lower complexity in implementation.