Advances in Cryptology - EUROCRYPT 2004

Volume 3027 of the series Lecture Notes in Computer Science pp 223-238

Efficient Selective-ID Secure Identity-Based Encryption Without Random Oracles

  • Dan BonehAffiliated withComputer Science Department, Stanford University
  • , Xavier BoyenAffiliated withVoltage Security


We construct two efficient Identity Based Encryption (IBE) systems that are selective identity secure without the random oracle model. Selective identity secure IBE is a slightly weaker security model than the standard security model for IBE. In this model the adversary must commit ahead of time to the identity that it intends to attack, whereas in the standard model the adversary is allowed to choose this identity adaptively. Our first secure IBE system extends to give a selective identity Hierarchical IBE secure without random oracles.