New USPS EPM Digitally Protects Microsoft Documents

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The U.S. Postal Service announced last week the availability of the USPS Electronic Postmark Extension for Microsoft Office, giving users tamper detection and date/time stamping of electronic documents and files.

The extension requires the user to digitally sign a document when applying a USPS Electronic Postmark within Microsoft Office XP and Microsoft Office 2003. The system will allow: digital signing of a Microsoft Office Word document using digital certificates; electronic content sealing and time/date stamping with the USPS EPM; and subsequent verification of an MS Word document's validity, authenticity and integrity.

The extension can be downloaded at It was co-developed by AuthentiDate Inc. and Microsoft.


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