2013 | OriginalPaper | Buchkapitel
Fully, (Almost) Tightly Secure IBE and Dual System Groups
verfasst von : Jie Chen, Hoeteck Wee
Erschienen in: Advances in Cryptology – CRYPTO 2013
Verlag: Springer Berlin Heidelberg
Aktivieren Sie unsere intelligente Suche um passende Fachinhalte oder Patente zu finden.
Wählen Sie Textabschnitte aus um mit Künstlicher Intelligenz passenden Patente zu finden. powered by
Markieren Sie Textabschnitte, um KI-gestützt weitere passende Inhalte zu finden. powered by
We present the first fully secure Identity-Based Encryption scheme (IBE) from the standard assumptions where the security loss depends only on the security parameter and is independent of the number of secret key queries. This partially answers an open problem posed by Waters (Eurocrypt 2005). Our construction combines the Waters’ dual system encryption methodology (Crypto 2009) with the Naor-Reingold pseudo-random function (J. ACM, 2004) in a novel way. The security of our scheme relies on the DLIN assumption in prime-order groups. Along the way, we introduce a novel notion of
dual system groups
and a new randomization and parameter-hiding technique for prime-order bilinear groups.