代理署名装置、署名者装置、署名検証装置及びそれらのプログラム - Nippon Telegraph and Telephone Corporation

Title:

代理署名装置、署名者装置、署名検証装置及びそれらのプログラム

Document Type and Number:

Japanese Patent JP4773941

Kind Code:

B2

Abstract:

To allow a signer to entrust a third party with signature generation processing while restricting a signature target.

A signer device selects an arbitrary value t, calculates h=H(m, t)εG2 with respect to a message m, calculates w=hskεG2 by using a secret key sk, and transmits m, t, w, and rk(=g1skεG1) to a proxy signature device 20. The proxy signature device 20 receives them, calculates f=e(g1, h)εG3, selects an arbitrary value r, calculates a=(g3)rεG3 and b=frεG3, calculates c=H'(m, t, w, a, b), and calculates z=(g1)r/(rk)cεG1. The proxy signature device transmits the message m and a signature σ=(t, w, c, z). In addition, ε is used as a mathematical character meaning a set.

Inventors:

Hoshino Literature
Kotaro Suzuki
Tetsutaro Kobayashi

Application Number:

JP2006333269A

Publication Date:

September 14, 2011

Filing Date:

December 11, 2006

Export Citation:

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Assignee:

Nippon Telegraph and Telephone Corporation

International Classes:

H04L9/32

Domestic Patent References:

JP10069220A
JP2001134179A

Foreign References:

WO2003090429A1

Other References:

満保雅浩 Masahiro MAMBO,閾値(委任)署名の匿名性に関する考察 On the Anonymity of Threshold (Proxy) Signatures,電子情報通信学会技術研究報告 Vol.99 No.701 IEICE Technical Report,日本,社団法人電子情報通信学会 The Institute of Electronics,Information and Communication Engineers,2000年,第99巻,p.95-100

Attorney, Agent or Firm:

Naoki Nakao
Taku Kusano
Yukio Nakamura

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