The Process
- An electronic document is created
- Digital Postmarking client software signs the document locally
- The signed document is sent to the Digital Postmarking service for postmarking
- Upon receipt, the Digital Postmark service first validates the authenticity of the signature
- If the signature is valid then a timestamp is generated by the DPM service as a counter-signature that includes the date and time
- The document, signature, validation results and timestamp are stored in the Digital Postmark non-repudiation database
- A Digital Postmark Receipt, including the validation results and the timestamp, is returned to the client software
- The client software wraps the original document with the DPM receipt
- To verify the signature, local cryptographic verification can do a quick check of integrity or the full receipt or even the original document can be retrieved from the DPM service using the XML Verify request by other parties at a later date and compared with the receipt stored with the document.
Read more about this topic: Digital Postmarks
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