一种基于余数嵌入的隐写算法

针对最低有效位嵌入数值的方法存在的缺点,设计一种新的数值嵌入方法——基于余数的嵌入法.该嵌入法根据余数映射表将载体数值的余数修改为某一区域内的随机值,同时修改载体数值的商,使得载体值在嵌入信息前后接近.映射表可自由设计,使得嵌入更加灵活和安全.与此同时,鉴于现有隐写算法多在离散余弦变换域隐藏信息、隐藏区域缺乏可变性的缺点,构造出在小波域内使用余数嵌入法的隐写算法.实验证明,当余数映射表的长度不太大时,该隐写算法具有很好的隐蔽性和安全性.

A steganography algorithm based on remainder embedded

Aiming at the existing disadvantages of least significant bit (LSB ) embedded numerical method , a new embedded numerical method was designed . According to the embedded remainder method ,it was based on a remainder mapping table ,the remainder of the carrier numerical was modified to the random value within a region ,at the same time , the quotient of the carrier numerical was modified to make sure that the carrier numerical value of the embedded information is close before and after the approach is adopted .The design of the mapping table was free so the embedded became more flexible and security .At the same time ,in view of the existing steganography algorithm for hiding information more in the discrete cosine transform (DCT ) domain and lacking in variability in hidden area ,a steganography algorithm which used the remainder embedding method in the wavelet domain was constructed . Experiments showed that the constructing algorithm had a good concealment ,robustness and security when the length of the remainder mapping table was not too large .