Where can I find information about signing of files? [closed]

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I am interested in learning more about signing files and removing signatures from files, programatically using C#, can anyone recommend a book or website covering this topic.

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Have a look at the excellent BouncyCastle C# crypto library.

It provides plenty of support for signing and verification. It supports CMS the IETFs standard for cryptographically protecting data.

Also:

• Alice and Bob style introduction to Digital Signatures

• An illustrated overview of how cryptographic hashes work

• How to: Sign XML Documents with Digital Signatures

• How to: Verify the Digital Signatures of XML Documents

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Please see C#: How to Sign and Verify Digital Signatures:

Beside from the security we squeeze from appliance such as firewall and antivirus, it is a must for our applications to have a second layer of defense. Most often than not you already have several company-wide applications that are interconnected to each other. If you have remote offices, your data will be transmitted over broadband network or internet but how sure are you that each of the application is only accepting data from valid sender? For example, a billing software at remote office that transmits payment confirmation to the financial system located at your head office. Fortunately for .NET developers we can make use of digital certificates. Using digital signatures, we can implement the following security check on our example scenario

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This is an interesting whitepaper:

http://www.microsoft.com/whdc/winlogo/drvsign/best_practices.mspx

Or this http://www.wintellect.com/CS/blogs/jrobbins/archive/2007/12/21/code-signing-it-s-cheaper-and-easier-than-you-thought.aspx link which I've used personally.

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unsingtool.exe can remove digital signatures, see How can I remove a digital signature from a DLL.