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Subject: slightly OT: validation codes Posted on: Sat, 10 May 2008 01:09:27 +0000 (UTC)

Does anyone know of any software which will allow a person to create a
hash of a file (say a text document) with a specific key. The idea
being that the hash can be published with the document, but the
original author can prove it was he who signed it (implying it was he
who wrote it).

Would such a system be admissable in a UK court as proof of prior
authorship ?