关键词: 无证书密码系统, 短签密, 临时密钥安全性

Abstract: Short signcryption is a technique which implements message encryption and digital signature in a logical single step，at lower computational times and message extension rates than the traditional signature-then-encryption approach.However，almost all short signcryption schemes that have been proposed until now have no creditable public key and signature verification is behind ciphertext decryption，which reduces the credibility of signcryption message and efficiency in dealing with fake message.A new certificateless-based short signcryption scheme is proposed and corresponding security models is defined，and the whole operation only requires one pairing operation.Moreover，the scheme has creditable public key and known session-specific temporary information security.Through analysis and validation，the scheme has defended network spam，since it carries out the confidentiality and authentication as the message transmission.

Key words: certificateless cryptography, short signcryption, known session-specific temporary information security