AS2 (Applicability Statement 2)

AS2 (Applicability Statement 2) is a specification for Electronic Data Interchange (EDI) between businesses using the Internet's Web page protocol, the Hypertext Transfer Protocol (HTTP).

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AS2 (Applicability Statement 2) is a specification for Electronic Data Interchange (EDI) between businesses using the Internet's Web page protocol, the Hypertext Transfer Protocol (HTTP). The specification is an extension of the earlier version, Applicability Statement 1 (AS1). Both specifications were created by EDI over the Internet (EDIINT), a working group of the Internet Engineering Task Force (IETF) that develops secure and reliable business communications standards.

The AS2 standard provides Secure Multi-Purpose Internet Mail Extensions (S/MIME) and uses HTTP or a more secure version, HTTPS, to transmit data over the Internet. AS1 uses a slower protocol, SMTP (Simple Mail Transfer Protocol). The use of HTTP or HTTPS allows communication in real time rather than through e-mail delivery. Security, authentication, message integrity, and privacy are assured by the use of encryption and digital signatures. Another important feature, nonrepudiation, makes it impossible for the intended recipient of a message to deny having received it.

The AS2 standard allows businesses to use a common, single communications solution. This eliminates the complications and costs involved when different businesses in a network use different transfer protocols. A Web server, an EDI transfer engine, and digital certificates are required for data exchange using AS2. Almost any type of data can be transmitted.

This was first published in September 2005

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