Patent · US Active

Signature verification system, signature apparatus, signature verification method, and program

US12278909B2 · kind B2 · utility

0Cited by

2References

8Claims

0Family size

Assignee

NEC CORPORATION · JP

Inventors

Hiroto TAMIYA · Tokyo, JP
Batnyam Enkhtaivan · Tokyo, JP
Toshiyuki Isshiki · Tokyo, JP

Key dates

Filing date	Jun 2, 2020
Grant date	Apr 15, 2025
Priority date	—
Expiry date	Dec 18, 2040

Classification

Technology area (CPC H)Electricity
CPC primaryH04L9/3239
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

A signature verification system includes: a signature apparatus configured to sign a first chameleon hash value, an unmodifiable part of the data, and a second chameleon hash value of an entirety of the data; a changing apparatus configured to change a public key for the changers of the temporary delegator to a public key for changers of an actual delegator, using a private key for the changers; a delegator changing apparatus configured to change a modifiable part of the data, using a private key for the changers of the actual delegator; and a verifying apparatus configured to verify the signature using the public key for the changers and the public key for the changers of the actual delegator.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.