Certificateless Encryption Scheme Secure in Standard Model

摘要

The scheme introduced by Hwang and Liu in 2008 is shown to be insecure against the key re-placement attack. A more practical attack model is introduced, and according to this model, an efficient cer-tificateless encryption scheme is presented which is IND-CCA secure against both Type Ⅰ and Type Ⅱ at-tackers without random oracle. This encryption scheme can defend against the malicious key generation center attack, and can reach Girault's trusted level 3 as in traditional public key infrastructure-based cryp-tography. This certificateless encryption scheme has a shorter public key than other schemes in the stan-dard model.