隐写式密码解密的目的非常简单：侦测可疑数据，确定数据中是否隐藏了信息，然后揭露该数据。
The goal of steganalysis is quite simple: Detect suspect data, determine whether information is hidden within the data, and recover that data.
这些细胞能侦测光线和触觉，然后把信息传达到肌肉细胞。
These cells detect light and touch, and then pass this information on to muscle cells.
此外，如果不是同时拥有原文件和改变后的文件，侦测几乎是不可能的，更不用说提取实际的信息了。
Furthermore, without having both the original and the altered image, detection-not to mention actual extraction of the information-becomes almost impossible.
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