Fourier domain asymmetric cryptosystem for privacy protected multimodal biometric security

TL;DR

This paper introduces a novel Fourier domain asymmetric cryptosystem that encrypts multimodal biometric data using private keys derived from other biometric modalities, enhancing privacy protection.

Contribution

It presents a new Fourier domain encryption method for multimodal biometrics, where private keys are synthesized from biometric signatures for secure encryption and decryption.

Findings

Feasibility demonstrated through computer simulations

Encryption leverages complex Fourier processing

Private keys are human-derived and biometric-based

Abstract

We propose a Fourier domain asymmetric cryptosystem for multimodal biometric security. One modality of biometrics (such as face) is used as the plaintext, which is encrypted by another modality of biometrics (such as fingerprint). A private key is synthesized from the encrypted biometric signature by complex spatial Fourier processing. The encrypted biometric signature is further encrypted by other biometric modalities, and the corresponding private keys are synthesized. The resulting biometric signature is privacy protected since the encryption keys are provided by the human, and hence those are private keys. Moreover, the decryption keys are synthesized using those private encryption keys. The encrypted signatures are decrypted using the synthesized private keys and inverse complex spatial Fourier processing. Computer simulations demonstrate the feasibility of the technique proposed.