Furthermore, the steg key recovery problem is studied in case of hidden message encrypted by password.Through the analysis of frequencies distribution graph, correct password can be easily attained.

• 通过研究从隐秘图像中所提取消息的字符频度分布，提出了对嵌入消息加密的密钥恢复解决方案，有效提高了隐写分析性能。