Asymmetric Key Construction Based on Palmprint Hash Coding

To address two key challenges: the absence of high-precision hash algorithms in palmprint feature cryptography, and private key secure storage in asymmetric cryptography. This paper proposes an asymmetric key generation method based on palmprint hash coding. First, the method generates a variable-length palmprint hash template through a hash mapping network, and uses the Bose–Chaudhuri–Hocquenghem (BCH) error-correcting algorithm to achieve consistency recovery of each newly generated template. Then, it employs a Token to ensure key revocability, and combines with the Rivest-Shamir-Adleman (RSA) key generation algorithm to finally generate an asymmetric key strongly bound to the user’s palmprint. Experimental results show that the method not only ensures the stable generation of keys but also achieves an Equal Error Rate (EER) of 0% on two public palmprint datasets. Additionally, the generated private key requires no additional storage and can be repeatedly regenerated through the palmprint and related processes, balancing security and practicality.