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中文摘要：
现有的聚合签密方案大多是签密后由任意用户对签密进行聚合.为了提高聚合签密的效率,设计了一种新的基于异或运算（exclusive OR,XOR）的无证书聚合签密方案.该方案可预先指定任意用户为聚合者,并由聚合者发起签密协议,各用户对消息签密后再由聚合者进行聚合.证明了该方案在随机预言模型下满足不可伪造性和保密性.与现有的几种聚合签密方案相比,提出的签密方案具有计算效率高的优点.
英文摘要：
Most of current signcryption schemes allow users to aggregate ciphertexts after ciphertexts of signcryption are generated. In order to improve the efficiency of aggregate signcryption, a new certificateless aggregate signcryption scheme based on XOR is proposed, which can designate aggregator beforehand. Any user can be designated as aggregator, the aggregator can initiate a signcryption protocol, and aggregate ciphertexts if he/she receives the ciphertexts from the users. Under the random oracle model, the scheme is proven to be existentially unforgeable and confidential. Compared with current aggregate signcryption scheme, the proposed scheme is more efficient.
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