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3

You can install GPG and run gpg -s your_document. You don't need to use a CA but your key can be uploaded to a key server and it will be certain that the key belongs to you if you have it signed in what is called a web of trust.


5

Yes you can cryptographically sign your work or any digital file as a matter of fact. The signing only computes a hash of the file or set of files and provides a mechanism for the user to verify that the hash is same. If the hash changes then the file has been tampered with and no longer satisfies signature. The system essentially ignores file type (a file ...



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