Cryptanalysis of a Hierarchical Identity-Based Encryption Scheme

Jian WENG  Min-Rong CHEN  Kefei CHEN  Robert H. DENG  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E93-A   No.4   pp.854-856
Publication Date: 2010/04/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E93.A.854
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Cryptography and Information Security
hierarchial identity-based encryption,  chosen-ciphertext attack,  chosen-plaintext attack,  

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Hierarchical Identity-Based Encryption (HIBE) is a generalization of identity-based encryption that mirrors an organizational hierarchy, and allows the root Private Key Generator (PKG) to distribute the workload of key generations to lower-level PKGs. In Indocrypt'08, Ren and Gu proposed a new HIBE scheme, and claimed that their scheme is fully chosen-ciphertext secure in the standard model. However, by giving a concrete attack, we show that Ren-Gu's HIBE is even not chosen-plaintext secure.