A scheme for cancelable fingerprint fuzzy vault based on chaotic sequence

Fuzzy vault is a recently developed cryptographic method to secure critical data with the biometric information in a way that only the authorized user can access the secret data by providing the valid biometric template. However, attackers can compromise them by cross-matching if they steel multiple vaults of a legal user. If a biometric identifier is compromised, it is lost forever and possibly for every application where the biometric is used. Facing this problem, a new scheme called cancelable fingerprint fuzzy vault based on chaotic sequence is proposed, which change original template into transformed template by using transformation function. Then, the transformed template is used to construct the vault. In the vault unlocking phase, the transformed input template is generated when the same transformation is applied to the input template. Experimental results show that our approach can protect the original template from crossing-matching by different transformed fingerprint templates in different applications. So, the higher level of security of the vault and secret data is achieved.