关键词: 秘密通信, 信息隐藏, 数字水印, 关系数据库

Abstract: A novel secret communication model using watermarking technology is presented．In this scheme，the plaintext of secret information is first encrypted with the private key，then the encrypted code is embedded into a database，and the watermarked database is transferred to the receiver via open media．The receiver first retrieves the encrypted massage，then decrypts it with the sender’s public key to get the plaintext.The secret communication model is proposed，with the corresponding embedding and extracting algorithms devised.Experimental results show that the scheme is hard to detect，more secure，practical and expandable.

Key words: secret communication, information hiding, digital watermark, relational database