Cryptographic Keys from Dynamic Hand-Signatures with Biometric Secrecy Preservation and Replaceability

Authors:
Yip Wai Kuan;Alwyn Goh;David Ngo;Andrew Teoh
Affiliations:
Multimedia University and Corentix Technologies;Corentix Technologies;Multimedia University and Corentix Technologies;Multimedia University and Corentix Technologies
Venue:
AUTOID '05 Proceedings of the Fourth IEEE Workshop on Automatic Identification Advanced Technologies
Year:
2005

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Abstract

We propose a method of extracting cryptographic key from dynamic handwritten signatures that does not require storage of the biometric template or any statistical information that could be used to reconstruct the biometric data. Also, the keys produced are not permanently linked to the biometric hence, allowing them to be replaced in the event of key compromise. This is achieved by incorporating randomness which provides high-entropy to the naturally low-entropy biometric key using iterative inner-product method as in Goh-Ngo, and modified multiple-bit discretization that deters guessing from key statistics. Our proposed methodology follows the design principles of block ciphers to result in unpredictable key space and secure construction.