Structure-Preserving Certificateless Encryption and Its Application.

Certificateless encryption (CLE) combines the advantages of public-key encryption (PKE) and identity-based encryption (IBE) by removing the certificate management of PKE and the key escrow problem of IBE. In this paper, we propose structure-preserving CLE schemes. Structure preservation enables efficient non-interactive proof of certain ciphertext properties, thus supporting efficient modular constructions of advanced cryptographic protocols with a simple design.