Stateful identity-based encryption scheme: faster encryption and decryption

Authors:
Le Trieu Phong;Hiroto Matsuoka;Wakaha Ogata
Affiliations:
Tokyo Institute of Technology, Tokyo, Japan;Tokyo Institute of Technology, Tokyo, Japan;Tokyo Institute of Technology, Tokyo, Japan
Venue:
Proceedings of the 2008 ACM symposium on Information, computer and communications security
Year:
2008

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Abstract

In this paper, we first present the notion of stateful identity-based encryption (IBE) and then extend standard security definitions for IBE to the stateful setting. After that, we demonstrate a concrete stateful IBE scheme, whose security meets the strongest definition in the setting in random oracle model, and whose encryption and decryption are very efficient, compared to existing IBEs: one pairing each for encryption and decryption.