Sciweavers

Share
CRYPTO
2009
Springer

Dual System Encryption: Realizing Fully Secure IBE and HIBE under Simple Assumptions

11 years 8 months ago
Dual System Encryption: Realizing Fully Secure IBE and HIBE under Simple Assumptions
We present a new methodology for proving security of encryption systems using what we call Dual System Encryption. Our techniques result in fully secure Identity-Based Encryption (IBE) and Hierarchical Identity-Based Encryption (HIBE) systems under the simple and established decisional Bilinear Diffie-Hellman and decisional Linear assumptions. Our IBE system has ciphertexts, private keys, and public parameters each consisting of a constant number of group elements. These results are the first HIBE system and the first IBE system with short parameters under simple assumptions. In a Dual System Encryption system both ciphertexts and private keys can take on one of two indistinguishable forms. A private key or ciphertext will be normal if they are generated respectively from the system’s key generation or encryption algorithm. These keys and ciphertexts will behave as one expects in an IBE system. In addition, we define semi-functional keys and ciphertexts. A semi-functional private...
Brent Waters
Added 26 May 2010
Updated 26 May 2010
Type Conference
Year 2009
Where CRYPTO
Authors Brent Waters
Comments (0)
books