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Practical Hierarchical Identity Based Encryption Scheme without Random Oracles

Xiaoming HU, Shangteng HUANG, Xun FAN

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Summary :

Recently, Au et al. proposed a practical hierarchical identity-based encryption (HIBE) scheme and a hierarchical identity-based signature (HIBS) scheme. In this paper, we point out that there exists security weakness both for their HIBE and HIBS scheme. Furthermore, based on q-ABDHE, we present a new HIBE scheme which is proved secure in the standard model and it is also efficient. Compared with all previous HIBE schemes, ciphertext size as well as decryption cost are independent of the hierarchy depth. Ciphertexts in our HIBE scheme are always just four group elements and decryption requires only two bilinear map computations.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E92-A No.6 pp.1494-1499
Publication Date
2009/06/01
Publicized
Online ISSN
1745-1337
DOI
10.1587/transfun.E92.A.1494
Type of Manuscript
PAPER
Category
Cryptography and Information Security

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