Abstract: Since the fairness of the existing Verifiably Encrypted Signature（VES） scheme depends entirely on a neutral arbiter, a safe and effective ID-based VES scheme is proposed on the basis of Shim’s signature scheme. An adjudicator signs a guarantee to avoid refusing to resume the common signature when resolving conflicts, thereby the equity of exchange signature protocols is enhanced. Compared to the previous schemes, the proposed scheme has less pairing operations and higher security. At last, the proposed scheme is provably secure in the random oracle model under the CDH problem assumption.

Key words: bilinear pairings, identity-based, Verifiably Encrypted Signature（VES）, guarantee, random oracle model

摘要： 针对目前可验证加密签名方案的公平性完全依赖仲裁者中立问题，基于Shim的数字签名方案，提出一个安全有效的基于身份的可验证加密签名方案。方案中仲裁者对自己的保证书签名，有效地解决了仲裁者在解决冲突时拒绝恢复普通签名问题，从而加强了交换签名的公平性。与已有的方案相比，该方案不仅具有极少的对运算，而且具有更高的公平性。在CDH问题难解的假设下，该方案在随机预言模型中可证明是安全的。

关键词: 双线性对, 基于身份, 可验证加密签名, 保证书, 随机预言模型