グループ暗号通信方法、認証方法、計算機及びプログラム

Title:

グループ暗号通信方法、認証方法、計算機及びプログラム

Document Type and Number:

Japanese Patent JP4371629

Kind Code:

B2

Abstract:

To perform group cryptographic communication among a plurality of user's computers without communicating with a server.

When a computer 1-C transmits a group entry request to a computer 1-A (S202-3) during the performance of group cryptographic communication between the computers 1-A, 1-B, exchange keys are exchanged among the computers 1-A to 1-C (S210-1, S210-3). Respective computers 1-A, 1-B, 1-C generate group secret keys on the basis of the received exchange keys (S211-1 to S211-3). Thereafter group cryptographic communication is performed by using the group secret keys. When the Diffie-Hellman type key exchange system is adopted, the exchange keys α, Z of the computers 1-A, 1-C are gamod p, gzmod p and group secret keys calculated by the computers 1-A, 1-C are Zamod p, αzmod p, so that the same value gazmod p is obtained. Namely the group cryptographic communication adopting the group secret keys can be performed without using a server.

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Inventors:

Nobutatsu Nakamura
Jun Noda

Application Number:

JP2002123480A

Publication Date:

November 25, 2009

Filing Date:

April 25, 2002

Export Citation:

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Assignee:

NEC

International Classes:

H04L9/08; H04L9/32

Domestic Patent References:

JP2002111679A
JP2002527992A
JP2000278258A

Attorney, Agent or Firm:

Masahiko Desk
Akitaka Kimura
Toshio Asai

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