Efficient Certificate-based Public-key Encryption Scheme
Jia Fan · Dianzi xuebao · 2008
In 2003,Gentry proposed a certificate-based public-key encryption(CBE) scheme.In CBE scheme,a third part signs a certification on an applicant's public key or identity and sends the certification to the applicant,the applicant saves it and uses it as a partial private key(decryption key).A receiver needs the certification from the third party and his own public-private keys to decrypt a ciphertext,so CBE scheme combines the best aspects of identity-based encryption(implicit certification) and public-key encryption(no key escrow).We present an efficient and tight certificate-based public-key hybrid encryption scheme,which can be proved satisfying adaptive chosen ciphertext attack security without random oracle.