"USPS Providing Electronic Postmarks"
Simply awesome. Need to check the details, but appears to respect privacy as well.
Excerpt:
...provides non-repudiation and legal timestamps of documentation by having the customer use a public-key to sign a hash of the document, which is then sent to [the] servers which combine that with a timestamp and sign with their key. So, [the server] does not have access to any of the data in the documentation.
FYI, the relevant Postal Service website is http://www.uspsepm.com/.
Excerpt:
...provides non-repudiation and legal timestamps of documentation by having the customer use a public-key to sign a hash of the document, which is then sent to [the] servers which combine that with a timestamp and sign with their key. So, [the server] does not have access to any of the data in the documentation.
FYI, the relevant Postal Service website is http://www.uspsepm.com/.
// 1/16/2004 
