A New Identity Based Encryption Scheme

Identity based encryption (IBE) has received great attention since Boneh and Franklin´s breakthrough work on bilinear group based IBE. Till now, many IBE schemes relying on bilinear groups with different properties have been proposed.In this paper, we propose a new IBE scheme. We prove this new IBE scheme is semantic secure under the selective identity chosen plaintext attacks (IND-sID-CPA) in the standard model based on a related DBDH assumption in the bilinear groups. To prove this IBE scheme´s security, we introduce some novel technique which maybe has independent interest.