基于语音信号和混沌序列的非对称图像隐藏方案

基于广义混沌同步系统(GS)和广义离散Sinai映射,提出了具有非对称密钥的数字图像安全通讯方案.方案能通过一个常规的语音信号隐藏几乎所有计算机所能识别的图像文件,以实现信息的伪装与隐藏,且含有24个密钥数并能无损恢复隐藏图像,密钥空间可达到10³⁶⁰.该方案能使接收方利用非对称密钥对收到的密文进行数据源真伪性认证和解密,适用于网络数字通讯语音伪装中的图像传输.对密钥空间、密钥参数敏感性和加密图像的相关性等分析表明该方案具有较高的安全性.

Non-symmetric digital image encryption scheme based on a generalized chaos synchronization system

Based on a generalized chaos synchronization (GCS) system and a generalized Sinai map, a non-symmetric digital cryptographic scheme was proposed. The scheme could hide, in conventional sound signals, various kinds of formatted images which a computer can recognize, realizing information disguise and hiding. This scheme with 24 keys could recover hidden images without any errors. The key space of the scheme was as large as 10³⁶⁰. The scheme had data origin authentication function. Even if a receiver could not communicate with the sender of encrypted data, the receiver can still conftrm whether the data are altered by an intruder. The scheme could be applied in the internet image transmissions disguised via sound signals. The analysis of the key space, the sensitivity of key parameters and the correlation of encrypted signals implied that this scheme had good security.