AS2 (EDI transmission protocol)
Quick answer
A secure protocol for transmitting EDI messages directly over the internet, with encryption and delivery receipt (MDN).
Key takeaways
- Encryption - content is encrypted (digital certificates)
- Digital signature - guarantees sender identity and integrity
- MDN (Message Disposition Notification) - a signed delivery receipt proving delivery (non-repudiation)
What AS2 is
AS2 (Applicability Statement 2) is a communication protocol for securely transmitting EDI messages directly over the internet between trading partners, without a VAN intermediary. Heavily used by large retailers (e.g. Walmart mandated AS2 for its suppliers).
How it ensures security
- Encryption - content is encrypted (digital certificates)
- Digital signature - guarantees sender identity and integrity
- MDN (Message Disposition Notification) - a signed delivery receipt proving delivery (non-repudiation)
AS2 vs VAN
A VAN (Value Added Network) is an intermediary routing messages (per-transaction cost). AS2 is a direct point-to-point connection (no per-message cost) but requires technical setup between partners.
How CRMconnect helps
CRMconnect supports AS2 for secure direct connections with partners that mandate it, managing certificates, encryption and MDNs - reliable EDI transmission and delivery proof, without per-transaction VAN costs.
Real-world example
A supplier entering an international retailer's programme had to communicate via AS2. CRMconnect configured the AS2 connection with certificates and MDNs, and the ORDERS/DESADV/INVOIC exchange became direct, secure and per-message cost-free.
Last updated:
Frequently asked
What is an MDN in AS2?+
Message Disposition Notification - the automatic, digitally signed confirmation that a message was received intact. It provides non-repudiation: proof the partner received the message, essential in contractual relationships.
AS2 or VAN - which do I choose?+
AS2 is a direct connection with no per-transaction cost but needs technical setup per partner. A VAN is an intermediary with per-message cost but simpler to connect to many partners. The choice depends on volume and partner requirements.
Is AS2 secure?+
Yes. It combines content encryption, digital signature (identity and integrity) and the MDN (delivery receipt), providing a secure channel with delivery proof over the public internet.
Where CRMconnect fits
Related terms
EDI (Electronic Data Interchange)
Structured exchange of commercial documents between B2B partners, without emails or manual data entry.
TechnologyOFTP2 (Odette File Transfer Protocol)
The standard EDI transmission protocol in the European automotive industry, for secure file exchange over the internet.
TechnologyVAN / SFTP (EDI transmission networks)
Methods of transporting EDI messages: VAN (value-added intermediary network) and SFTP (secure file transfer).
TechnologyWebhook
HTTP push notification sent automatically on event - the opposite of "polling".