Digital signature system, method and recording medium

JP2025091630APending Publication Date: 2025-06-19NEC CORP
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Patent Information

Application Number
JP2023206988
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-12-07
Publication Date
2025-06-19

AI Technical Summary

Technical Problem

Digital signatures using biometric information face challenges in managing key security, as leakage of biometric information can lead to key leakage, and it is difficult to change biometric information once it is compromised.

Method used

A digital signature system that employs a two-party distributed signature generation process using first and second auxiliary data derived from biometric information and distributed keys, ensuring secure key management and reducing risks of key loss and leakage.

Benefits of technology

The system effectively reduces the risks of key loss and leakage by utilizing a distributed signature generation process, ensuring secure biometric data management and maintaining the integrity of digital signatures.

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Abstract

To provide system, method, and program recording medium that simultaneously reduce the risks of both key loss and key leakage in digital signatures.SOLUTION: A system 100 includes an entity A and an entity B. The entity A receives first auxiliary data created using a first signature key and first biometric information and registers it in a storage unit. The entity B acquires second biometric information, generates a second shared key, acquires a message to be signed, generates second auxiliary data from the second biometric information and the second shared key, and transmits the message and the second auxiliary data to the entity A. The entity A generates a first shared key using the first auxiliary data and the second auxiliary data. The entity A and the entity B execute two-party shared signature generation processing using the first shared key and the second shared key to generate a signature for the message.SELECTED DRAWING: Figure 1
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Citation Information

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