Conference key agreement protocol using oblivious transfer

Ari Moesriami Barmawi, Shingo Takada, Norihisa Doi

研究成果: Conference contribution


The basic idea of our protocol is establishing a conference key based on oblivious transfer which can be used in either asymmetric or symmetric cryptography, such that we can reduce the number of decryptions for the key confirmation without sacrificing the level of security. In our proposed method, we break the conference key into several individual secret keys in accordance with the amount of members within the group. This individual key will be used by each member to sign (encrypt (asymmetrically)) the established conference key in the key confirmation procedure. Then, each member multiplies all signed conference keys and decrypting (asymmetrically) the multiplied signed conference key using the multiplicative inverse of his locally calculated conference key. Thus, each member only needs to perform one decryption for the key confirmation. Furthermore, by using the individual secret key, each member can directly communicate with each other by a support of the leader, while the leader does not gain any knowledge of messages which is exchanged between the communicating members. The last features can not be found in the previous method except in Li-Pieprzyk's. However, for the key generation we need only a less modular exponentiations than the former.

ホスト出版物のタイトルData and Applications Security
ホスト出版物のサブタイトルDevelopments and Directions - IFIP TC11 / WG11.3 Fourteenth Annual Working Conference on Database Security
出版社Springer New York LLC
ISBN(印刷版)0792375149, 9780792375142
出版ステータスPublished - 2001 1月 1
イベントIFIP TC11 / WG11.3 14th Annual Working Conference on Database Security - Schoorl, Netherlands
継続期間: 2000 8月 212000 8月 23


名前IFIP Advances in Information and Communication Technology


OtherIFIP TC11 / WG11.3 14th Annual Working Conference on Database Security

ASJC Scopus subject areas

  • 情報システム
  • コンピュータ ネットワークおよび通信
  • 情報システムおよび情報管理


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