具有完全保密性的高效可净化数字签名方案*

现有的基于变色龙散列函数的方案均未达到完全保密性，而基于群签名的可净化数字签名方案满足完全保密性，但因效率较低而不够实用。为此，提出一个新的可净化数字签名方案，它基于传统数字签名方案、BLS签名方案和公钥加密方案构造，且满足可净化数字签名的所有基本安全性需求，即不可伪造性、不可变性、透明性、完全保密性及可审计性，同时具有比基于群签名方案更高的运算效率，继而具有更高的实用性。

Efficient sanitizable signature schemes with full privacy

The existing chameleon hash-based constructions do not achieve full privacy, while the group signature-based construction that achieves full privacy was not efficient enough and thus not practical. In order to solve this problem, this paper proposed a new sanitizable signature scheme. The construction was based on conventional digital signature scheme, the BLS signature scheme and public key encryption scheme, and meet all the fundamental security requirements of sanitizable signatures, i.e., unforgeability, immutability, transparency, full privacy and accountability, and reached higher computational efficiency than group signature-based construction and thus higher practicality.