A Novel Convertible Authenticated Encryption Scheme based on RSA Assumption

An authenticated encryption allows the specific recipient to verify the authenticity while recovering the message. To protect the recipient’s interest in case of a later dispute, a convertible authenticated encryption scheme allows the specific recipient to retrieve an authenticated cipher text and convert the authenticated ciphertext into an ordinary signature so that it becomes publicly verifiable. In this paper, we propose a novel and secure convertible authenticated encryption scheme based on RSA assumption. The proposed scheme allows the specific recipient to convert the authenticated ciphertext into an ordinary signature without extra computation efforts or communication overheads. To analyze the security of our proposed scheme, we use the techniques from provable security.