About PGP Signing a File.

[Joel Bryan Juliano]

Hi,

 I have a question regarding signing a file or binary, I installed
Seahorse which is really awesome tool! And it has a nautilus-extension
that easily Encrypt and Sign a file or directory by right-clicking the
file. Can someone please tell me the use of signing a binary file or
directory? I know it's important, but I really don't get it.

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