### Efficient Hierarchical Identity Based Signature in the Standard Model

Man Ho Au, Joseph K. Liu, Tsz Hon Yuen, and Duncan S. Wong

##### Abstract

The only known constructions of Hierarchical Identity Based Signatures that are proven secure in the strongest model without random oracles are based on the approach of attaching certificate chains or hierarchical authentication tree with one-time signature. Both construction methods lead to schemes that are somewhat inefficient and leave open the problem of efficient direct construction. In this paper, we propose the first direct construction of Hierarchical Identity Based Signature scheme that is proven under the strongest model without relying on random oracles and using more standard $q$-SDH assumption. It is computationally efficient and the signature size is constant. When the number of hierarchical level is set to be one, our scheme is a normal identity based signature scheme. It enjoys the shortest size in public parameters and signatures when compare with others in the literature, with the same security level.

Available format(s)
-- withdrawn --
Category
Public-key cryptography
Publication info
Published elsewhere. Unknown where it was published
Keywords
Identity Based Signature
Contact author(s)
ksliu9 @ gmail com
History
2007-11-02: withdrawn