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基于身份的无密钥托管的变色龙hash函数和签名

Keywords: 数字签名,基于身份的体制,密钥托管,变色龙hash函数,变色龙签名

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Abstract:

提出了一个基于身份的无密钥托管的变色龙hash函数.它在保持基于身份的变色龙hash函数的原有性质的同时,解决了基于身份体制中固有的密钥托管问题:即在该方案中,私钥产生中心(PKG)无法计算变色龙hash函数的碰撞.在此基础上,进一步使用基于身份的无密钥托管的加密方案和签名方案,实现了基于身份的无密钥托管的变色龙签名,保证了PKG无法伪造对应的变色龙签名.最后,证明了该方案满足抗碰撞性、语义安全性、消息隐藏特性和无密钥托管性.

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