我应该采用哪种压缩/加密？
我们开发了一项服务，用于发送电子邮件……这一步非常简单。
下一步是：处理退回邮件。
为了实现这一点，我需要在标题中添加一些信息......假设这是一个简单的字符串（以使问题保持基本）。
当我正在寻找一种内部包含校验和的算法时（我不想创建 CRC 或类似内容并将其添加到标头中），我应该采用哪种压缩/加密（首选.net内置）-因此，更改加密/压缩字符串的某些字符并不意味着它是有效的！
这不一定是“高度复杂”的算法，因为我只想对更改/注入进行基本检测......
只是要明确：必须有机会解压缩/解密！
We've developed a service, which sends e-mails... quite trivial at this step.
The next step will be: handling the bounces.
To implement this I need to add some information into the headers... Let's say it's a simple string (to keep the question really basic).
Which compression/encryption (.net-built-in prefered) should I take, when I'm looking for an algorithm which includes a checksum internally (I do not want to create a CRC or alikes and add it to the headers either) - so, changing some char of the encrypted/compressed string doesn't mean it's valid!
This need not be a "high-sofisticated" algorithm, as I just want a basic detection against changes/injections...
Just to be clear: There must be a chance to decompress/decrypt!
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如果您需要解压缩/解密消息，您可能需要双向加密。我不是这方面的专家，但我认为 .NET 内置了对 AES 的支持，这是一种 Rijndael 算法。您可以获取更多信息
If you need to decompress/decrypt the message, you probably want a two-way encryption. I am not an expert here, but I think .NET comes with built-in support for AES, which is a Rijndael algorithm. You can get more information here.
您考虑过/读过 OpenPGP 吗？ 这个所以线程对您来说可能是一个很好的起点。
Have you thought/read about OpenPGP? This SO thread might be a good starting point for you.
要回答其中的压缩部分，您可能需要考虑使用 System.IO. Compression.GZipStream 或 System.IO. Compression.DeflateStream 类进行压缩。 DeflateStream 使用 LZW 压缩（带有一点黑客技术），与 ZLib 兼容（http://stackoverflow.com/questions/70347/zlib-complete-compression-streams）。
To answer the compression part of it, you may want to consider either the System.IO.Compression.GZipStream or System.IO.Compression.DeflateStream classes for compression. DeflateStream uses LZW compression that is (with a bit of hackery), compatible with ZLib (http://stackoverflow.com/questions/70347/zlib-compatible-compression-streams).