强指定验证者的无证书变色龙数字签名方案

Certificateless chameleon digital signature scheme for strong designated verifier

基于无证书密码体制,构造了一个无证书变色龙哈希函数,解决了基于身份的变色龙哈希存在的密钥托管问题,使除了指定验证者之外的其他任何人都无法计算出变色龙哈希碰撞。在此基础上,进一步实现了无证书变色龙签名。在签名验证过程中,保证只有签名者指定的验证者才能验证签名的有效性。新方案简单高效,在随机预言模型下是安全的。

A certificateless chameleon hash function was constructed based on the certificateless cryptography. It resolves the key escrow problem in identity-based chameleon hashing perfectly. No one except the specified verifier can find a collision of our proposed chameleon hash function. Moreover, a certificateless chameleon signature was given in this paper. The designated verifier only can verify the validity of signature in the verification process of our scheme. The new scheme is simple and efficient, which is secure in the random oracle model.