基于指纹的可撤销Fuzzy vault方案

Fuzzy vault是一种用生物特征保护密钥的加密框架，其主要缺点在于攻击者可以通过交叉比较同一用户的不同vault来获得生物模板的准确信息，从而可以破解vault。提出了一种使用基于指纹细节点的可撤销的变换模板作为生成vault的模板，保护不同密钥时采用不同变换模板，从而解决了这个问题。采用以巴特沃斯低通滤波器为核的函数组作为生成可撤销模板的变换函数。此外还使用了用户口令加密vault，从而进一步增强了被保护密钥的安全性。

Cancelable fingerprint fuzzy vault scheme

Fuzzy vault is a cryptographic framework that binds the biometric template with a cryptographic key. However, attackers can easily compromise them if they steel more than two vaults of a legal user by cross matching. A new scheme named cancelable fuzzy vault was proposed to overcome this shortcoming, which generated different vaults from different cancelable templates instead of the origin template. In our scheme, a mixture of butterworth low filter was taken as the transform function which generated a cancelable template. In addition, users' passwords were adopted to encrypt the vaults to improve their security.