Cryptology ePrint Archive: Report 2005/021

Partial Hiding in Public-Key Cryptography

Eabhnat Ní Fhloinn and Michael Purser

Abstract: This paper explores the idea of partially exposing sections of the private key in public-key cryptosystems whose security is based on the intractability of factorising large integers. It is proposed to allow significant portions of the private key to be publicly available, reducing the amount of data which must be securely hidden. The ``secret'' data could be XORed with an individual's biometric reading in order to maintain a high level of security, and we suggest using iris templates for this purpose. Finally, we propose an implementation of this system for RSA, and consider the potential risks and advantages associated with such a scheme.

Category / Keywords: public-key cryptography / public-key cryptography, RSA, partial key exposure, partial hiding, iris, biometrics

Date: received 25 Jan 2005, last revised 2 Feb 2005

Contact author: evoflynn at maths tcd ie

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Version: 20050202:193332 (All versions of this report)

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