Abstract: Certificateless cryptosystem realizes the properties of the certificateless, and the key-unescrow. So Certificateless Verifiably Encrypted Signature Scheme (CVES) was proposed,which is composed of Ccrtificateless Encryption Scheme and Verifiably Encrypted Signature Scheme. Finally, the correctness and unforgeability of CVES was proved.This scheme can effectively overcome the malicious signature and collusion attack.

Key words: Bilinear pairing, Certificatcless cryptosystem, Verifiably encrypted signature, Unforgcability