鍵共有方法、第1装置、第2装置、及び、それらのプログラム - Nippon Telegraph and Telephone Corporation

Title:

鍵共有方法、第1装置、第2装置、及び、それらのプログラム

Document Type and Number:

Japanese Patent JP4922139

Kind Code:

B2

Abstract:

To provide efficient key sharing technique capable of ensuing safety in a standard model.

A first device uses x=äF1(rx)(a1, a2, a3, a4)+F2(a1, a2, a3, a4)(rx)}mod p to obtain X1=g1xand X2=g2xfor transmitting to a second device. A second device uses y=äF1(ry)(b1, b2, b3, b4)+F2(b1, b2, b3, b4)(ry)}mod p to obtain Y1=g1yand Y2=g2yfor transmitting to the first device. The second device obtains c=H1(A, Y1, Y2), d=H2(B, X1, X2), and σ=X1(b1+d×b3+y)×X2(b2+d×b4+y)×A1y×A2c×y, and calculates a key K=Fσ(A, B, X1, X2, Y1, Y2). The first device obtains c=H1(A, Y1, Y2), d=H2(B, X1, X2) and σ=Y1(a1+c×a3+x)×Y2(a2+c×a4+x)×B1x×B2d×x, and calculates the key K=Fσ(A, B, X1, X2, Y1, Y2).

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Inventors:

Tatsuaki Okamoto

Application Number:

JP2007306738A

Publication Date:

April 25, 2012

Filing Date:

November 28, 2007

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Assignee:

Nippon Telegraph and Telephone Corporation

International Classes:

H04L9/08

Domestic Patent References:

JP2009526411A
JP2009130871A

Foreign References:

WO2006084896A1

Other References:

Tatsuaki Okamoto,Authenticated Key Exchange and Key Encapsulation in the Standard Model,13th International Conference on the Theory and Application of Cryptology and Information Security Kuching, Malaysia, December 2-6, 2007 Proceedings,Springer,2007年12月,p.474-484
岡本龍明,鍵交換:現代暗号の誕生とその発展,Fundamentals Review,社団法人電子情報通信学会,2008年 4月 1日,Vol.1 No.4,p.70-76

Attorney, Agent or Firm:

Naoki Nakao
Yukio Nakamura
Yoshimura Munehiro
Taku Kusano

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