imbedded computer codes

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I'm writing a spy thriller and need to know the following:
Person A in an Intelligence Service sends without permission a damning top secret file to Person B outside that Service. How would it be possible for Person B, the receipient of that top secret file, to prove it is authentic, that it came from that Service? Would it be possible for him to show that SERVICE-SPECIFIC ID computer codes, imbedded in that Intelligence Service's file, prove that file was authentic, that it did come from that Service?

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@steveo1234,

http://en.wikipedia.org/wiki/Digital_signature

Quote:

A digital signature or digital signature scheme is a mathematical scheme for demonstrating the authenticity of a digital message or document. A valid digital signature gives a recipient reason to believe that the message was created by a known sender, and that it was not altered in transit. Digital signatures are commonly used for software distribution, financial transactions, and in other cases where it is important to detect forgery or tampering.

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