量子令牌认证(QTA)结合了权限控制和签名功能，确保被授权的用户只能够完成一次身份和消息的认证。作为量子签名的重要应用，目前QTA的研究仅关注无仲裁下的两方认证功能实现方法，并没有分析签名接收者对于量子令牌签名的伪造，也没有考虑量子令牌权限的实时修改。为了解决这些问题，本项目拟提出基于离线仲裁的量子令牌认证(OffA-QTA)新模型，即在可信授权者不直接介入令牌签名验证的情况下，设计安全可用的QTA协议。具体内容包括：解决不诚实参与方之间的密钥分配和验证问题；给出抗参与者攻击的令牌签名生成算法，提出接收者可独立验证签名有效性的策略；研究量子令牌可修改和撤销的一般方法，分析OffA-QTA的应用前景。本项目的研究将提高现有量子令牌认证协议的安全性，推动后续量子令牌认证理论的发展，促进量子签名应用体系的完善。

Quantum token authentication (QTA), which combines the access control with signing functions, makes the authorized signer have only one chance to authenticate her identity and the signed messages. As a significant application topic of quantum signature, the existing QTA protocols only focus on the achievement of the authentication function between the signer and receiver when the arbitrator is absent. It can be seen that the receiver’s forgery of the token signature and the modify of the quantum tokens in real time have not been discussed until now. In order to solve the problems above, a new offline arbitrated quantum token authentication (OffA-QTA) model will be presented in this project. Here we will propose some secure and valid QTA protocols when the honest delegator does not verify quantum token signature directly. Detailly, the project includes the following three directions: firstly, we will solve the problem that how to distribute and verify the keys among the dishonest participants; secondly, we will propose some encryption algorithms which generate the quantum token signature to prevent the participant attacks, and give some strategies to make the receiver can verify the token signature himself; finally, we will design the general methods to modify and repeal the authorized quantum tokens and analyze the prospect of OffA-QTA. In all, the achievement of this project will improve the security of the existing QTA protocols, promote the further development of QTA theory and give the positive efforts to the application of quantum signature.