Digital signatures should work, according to some research I did earlier in the year. No hands on experience with them though.
http://www.adobe.com/security/digsig.html
Quote:
With powerful encryption technology and public key infrastructure (PKI) support, Adobe digital signature solutions enable enterprises to exchange documents electronically with:
Assurance that the information has not been altered since it was sent
Verification of the signer's digital identity
In partnership with leading security vendors, including RSA, Entrust, VeriSign, GeoTrust, and ActivCard, Adobe Document Services provide enterprise solutions that instill trust in electronic documents while protecting brand integrity.
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"Wake up, Luigi! The only time plumbers sleep on the job is when we're working by the hour."
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