Applying Cryptography to Cancellable Signatures

Biometric characteristics are largely immutable, i.e. unprotected storage of biometric data provokes serious privacy threats, e.g. identity theft, limited renewability or cross-matching. Once compromised, biometric traits cannot be canceled or reissued. To handle above issues in case of behavioral biometric-signatures, the author proposes to generate a non-invertible cryptographic key from cancelable online signature templates. Initially, a noninvertible transformation is applied on the grid and texture features extracted from online signatures. Subsequently, the transformed points form cancelable templates which are then utilized to generate a unique non-invertible key.

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