King Abdulaziz University
The authors present a new practical Identity-Based Encryption (IBE) system that can be another candidate for standard IBE techniques. Their construction is based on a new framework for realizing an IBE trapdoor from pairing-based groups, which is motivated from the 'Two equation' revocation technique suggested by the researchers. The new framework enables their IBE system to achieve a tight security reduction to the decision bilinear Diffie-Hellman assumption. Due to its the tightness, their system can take as input the shorter size of security parameters than the previous practical BF, SK, and BB1 systems, which provides better efficiency to their system in terms of computational cost.