AS1 (networking)

AS1 technical overview

• Files are sent as "attachments" in a specially coded SMIME email message
• Messages can be signed, but do not have to be
• Messages can be encrypted, but do not have to be
• Messages may request an MDN back if all went well, but do not have to request such a message
• If the original AS1 message requested an MDN...
• * Upon the receipt of the message and its successful decryption or signature validation a "success" MDN will be sent back to the original sender. This MDN is typically signed but not encrypted.
• **Upon the receipt and successful verification of the signature on the MDN, the original sender will "know" that the recipient got their message
• * If there are any problems receiving or interpreting the original AS1 message, a "failed" MDN may be sent back.