We develop some methods for evaluating the security of lsb steganography using randomness test and two - dimension self - correlation function . 4 ) evaluation of the statistical visibility of information hiding algorithms 提出了基于二维自相关函数径向谱和随机性检验(包括顺序检验、游程检验和一维自相关检验)的lsb信息隐藏安全性评估方法。