A Novel Commutative Blinding Identity Based Encryption Scheme

In EUROCRYPT 2004, Boneh and Boyen presented two efficient Identity Based Encryption (IBE) schemes that are selective-identity secure in the standard model. Particularly, the first one known as BB1-IBE, which is characterized by commutative blinding technique (BB1-style), distinguishes itself as the most fertile ground for many applications. They also proved that BB1-IBE is fully secure in the random oracle model but with a looser reduction. In this paper, we propose a novel IBE scheme of BB1-style, which is fully secure in the random oracle model with a tighter reduction. Additionally, we give a chosen ciphertext secure construction of our scheme from twin technique.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000306616500007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Computer Science, Theory & MethodsCPCI-S(ISTP)