Cryptanalysis of Two Efficient HIBE Schemes in the Standard Model

Xu An Wang; Xiaoyuan Yang

Paper 2010/113

Cryptanalysis of Two Efficient HIBE Schemes in the Standard Model

Xu An Wang and Xiaoyuan Yang

Abstract

In Informatica 32 (2008), Ren and Gu proposed an anonymous hierarchical identity based encryption scheme based on the q-ABDHE problem with full security in the standard model. Later in Indocrypt'08, they proposed another secure hierarchical identity based encryption scheme based on the q-TBDHE problem with full security in the standard model. They claimed that their schemes have short parameters, high efficiency and tight reduction. However, in this paper we give attacks to show their schemes are insecure at all. Concretely, from any first level private key, the adversary can easily derive a proper ``private key'' which can decrypt any ciphertexts for the target identity. That is to say, one key generation query on any first level identity excluding the target's first level identity, is enough to break their schemes.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Published elsewhere. Unknown where it was published
Contact author(s): wangxahq @ yahoo com cn
History: 2010-04-01: last of 2 revisions; 2010-03-04: received; See all versions
Short URL: https://ia.cr/2010/113
License: CC BY

BibTeX

@misc{cryptoeprint:2010/113,
      author = {Xu An Wang and Xiaoyuan Yang},
      title = {Cryptanalysis of Two Efficient {HIBE} Schemes in the Standard Model},
      howpublished = {Cryptology {ePrint} Archive, Paper 2010/113},
      year = {2010},
      url = {https://eprint.iacr.org/2010/113}
}