Generalization of the Selective-ID Security Model for HIBE Protocols
نویسندگان
چکیده
We generalize the selective-ID security model for HIBE by introducing two new security models. Broadly speaking, both these models allow the adversary to commit to a set of identities and in the challenge phase choose any one of the previously committed identities. Two constructions of HIBE are presented which are secure in the two models. Further, we show that the HIBEs can be modified to obtain a multiple receiver IBE which is secure in the selective-ID model without the random oracle assumption.
منابع مشابه
Constant Size Ciphertext HIBE in the Augmented Selective-ID Model and its Extensions
At Eurocrypt 2005, Boneh, Boyen and Goh presented a constant-size ciphertext hierarchical identity-based encryption (HIBE) protocol. Our main contribution is to present a variant of the BBG-HIBE. The new HIBE is proved to be secure (without any degradation) in an extension of the s-ID model (denoted the s-ID model) and the components of the identities are from Zp, where p is a suitable large pr...
متن کاملOn (Hierarchical) Identity Based Encryption Protocols with Short Public Parameters (With an Exposition of Waters' Artificial Abort Technique)
At Eurocrypt 2005, Waters proposed an efficient identity based encryption (IBE) scheme. One drawback of this scheme is that the size of the public parameter is rather large. Our first contribution is a generalization of Waters scheme. In particular, we show that there is an interesting trade-off between the tightness of the security reduction and smallness of the public parameter size. For a gi...
متن کاملEfficient (Anonymous) Compact HIBE from Standard Assumptions
We present two hierarchical identity-based encryption (HIBE) schemes, denoted as H1 and H2, from Type-3 pairings with constant sized ciphertexts. Scheme H1 achieves anonymity while H2 is non-anonymous. The constructions are obtained by extending the IBE scheme recently proposed by Jutla and Roy (Asiacrypt 2013). Security is based on the standard decisional Symmetric eXternal Diffie-Hellman (SXD...
متن کاملHIBE with Polynomially Many Levels
We present the first hierarchical identity based encryption (HIBE) system that has full security for more than a constant number of levels. In all prior HIBE systems in the literature, the security reductions suffered from exponential degradation in the depth of the hierarchy, so these systems were only proven fully secure for identity hierarchies of constant depth. (For deep hierarchies, previ...
متن کاملUnbounded Hierarchical Identity-Based Encryption with Efficient Revocation
Hierarchical identity-based encryption (HIBE) is an extension of identity-based encryption (IBE) where an identity of a user is organized as a hierarchical structure and a user can delegate the private key generation to another user. Providing a revocation mechanism for HIBE is highly necessary to keep a system securely. Revocable HIBE (RHIBE) is an HIBE scheme that can revoke a user’s private ...
متن کامل