Cryptology ePrint Archive: Report 2008/327

Blind HIBE and its Applications to Identity-Based Blind Signature and Blind Decryption

Le Trieu Phong and Wakaha Ogata

Abstract: We explicitly describe and analyse \textit{blind} hierachical identity-based encryption (\textit{blind} HIBE) schemes, which are natural generalizations of blind IBE schemes \cite{gh07}. We then uses the blind HIBE schemes to construct: (1) An identity-based blind signature scheme secure in the standard model, under the computational Diffie-Hellman (CDH) assumption, and with much shorter signature size and lesser communication cost, compared to existing proposals. (2) A new mechanism supporting a user to buy digital information over the Internet without revealing what he/she has bought, while protecting the providers from cheating users.

Category / Keywords: cryptographic protocols / blind HIBE, blind signature, blind decryption

Publication Info: IEICE Trans. Fundamentals, Vol.E92-A, No.8, August 2009

Date: received 28 Jul 2008, last revised 12 Aug 2009

Contact author: letrieu letrieuphong at gmail com

Available format(s): PDF | BibTeX Citation

Note: Update the publication info. The title in the IEICE journal is "New Identity-Based Blind Signature and Blind Decryption Scheme in the Standard Model"

Version: 20090812:071216 (All versions of this report)

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