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Published in:
1988 | OriginalPaper | Chapter
Attack on the Koyama-Ohta Identity Based Key Distribution Scheme
Author : Yacov Yacobi
Published in: Advances in Cryptology — CRYPTO ’87
Publisher: Springer Berlin Heidelberg
Included in: Professional Book Archive
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Koyama and Ohta proposed an identity based key distribution scheme. They considered three configurations: ring, complete graph, and star. The most practical configuration is the star which is used in teleconferencing. We show the Koyama-Ohta star scheme to be insecure. Specifically, we show that an active eavesdropper may cut one of the lines, and perform a bidirectional impersonation, thus establishing two separate keys. One with each side.