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Security Analysis of a Multi-Receiver Identity-Based Key Encapsulation Mechanism

Jong Hwan PARK, Dong Hoon LEE

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Summary :

In INDOCRYPT 2006, Chatterjee and Sarkar suggested a multi-receiver identity-based key encapsulation mechanism that is secure in the full model without random oracles. Until now, it has been believed that their scheme is the only one to provide such a security feature, while achieving sub-linear size ciphertext. In this letter, we show that their scheme is insecure in the sense that any revoked user can retrieve a message encryption key, even without colluding with other revoked users. Our attack comes from an analysis of a publicly computable surjective function used in the scheme.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E92-A No.1 pp.329-331
Publication Date
2009/01/01
Publicized
Online ISSN
1745-1337
DOI
10.1587/transfun.E92.A.329
Type of Manuscript
LETTER
Category
Cryptography and Information Security

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