一個可證明安全的認證式加密法.pdfVIP

類 93 年 24(1) 13-20 1 1 2 1 2 葉 數 ; , , 不 , (Adaptively chosen message attack), , , Schnorr數 率 數 93 年08 10 93 年09 10 93 年09 17 13 A Provable Secure Scheme for Convertible Authenticated Encryption 1* 1 2 Fuw-Yi Yang Chih-Hui Chen Yeong-Nan Hwu 1Department of Electronic Engineering, Chienkuo Technology University, Changhua City 500, Taiwan, R.O.C. 2 Department of Electrical Engineering, Da-Yeh University, Changhua, Taiwan, R.O.C. Abstract This paper proposes a provable secure scheme for convertible authenticated encryption. The scheme allows a receiver converting a ciphertext into a conventional signature. Thus the scheme possesses the property of non-repudiation without the help of a third trusted party. To show our proposed scheme is secure against adaptively chosen message attacks, we further provide a formal proof. Besides, the communicational and computational complexity of the proposed scheme is as efficient as Schnorr’s digital signature scheme. Key words Convertible authenticated encryption scheme, Digital signature, Signcryption. 14 A Provable Secure Scheme for Convertible Authenticated Encryption