CAJ | 학술논문

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。
침대목전가험증가밀첨명방안적공평성완전의뢰중재자중립문제，기우Shim적수자첨명방안，제출일개안전유효적기우신빈적가험증가밀첨명방안。방안중중재자대자기적보증서첨명，유효지해결료중재자재해결충돌시거절회복보통첨명문제，종이가강료교환첨명적공평성。여이유적방안상비，해방안불부구유겁소적대운산，이차구유경고적공평성。재CDH문제난해적가설하，해방안재수궤예언모형중가증명시안전적。
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.