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Home Backend Development PHP Tutorial 如何在文件内写入数据,而不破坏文件结构。

如何在文件内写入数据,而不破坏文件结构。

Jun 06, 2016 pm 08:19 PM
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如何在一个文件内写入数据,而且不破坏文件的结构。比如.txt .zip .db,写入数据后还能正常使用。但是看不见数据。

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如何在一个文件内写入数据,而且不破坏文件的结构。比如.txt .zip .db,写入数据后还能正常使用。但是看不见数据。

对于TXT这样的文件,基本不现实。

对于有些文件,解析器会默认有一个“文件结束”标记,例如一段Pascal源代码,只要遇到了end.,就表示文件结束了,后面随便写什么都可以,编译器是不会对其进行编译的。

那么就有这样一个思路:我们把数据追加到文件的“结束标记”之后。
例如对于jpg文件,假设我们有一个a.jpg,我们的敏感数据是b.zip,要把它隐藏到a.jpg中,我们可以这么写:

<code>copy /b a.JPG + b.zip c.JPG
</code>
Copy after login

这样,c.jpg就是我们最后生成的文件。

此外还有一个叫“内容覆盖法”的方法,不过比较麻烦……
还有一些隐写的工具,楼主有兴趣也可以试试。

参考资料:https://program-think.blogspot.com/2011/06/use-image-hide-information.html

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