Filter by Category

What's the Difference Between AS2, AS3, and AS4?

Man using magnifying glass to view AS2, AS3, and AS4 text

If you think these three protocols are simply sequential updates from the 1990s’ AS1 protocol you’d be mistaken. Each protocol brings its own distinct features to the data transmission table. Here’s a few key differences between them.

What is AS2?

AS2 (Applicability Statement 2) is a protocol specification used to transmit sensitive data securely and reliably over the internet. AS2 supports the encryption of messages between trading partners and vendors via HTTPS. Data is protected with digital certificates and encryption standards while in transit across systems, networks, and locations.

Why Use AS2?

Organizations often choose AS2 over other file transfer protocols (like FTP or SFTP) because of how easily the protocol helps them meet regulatory compliance requirements and trading partner needs. AS2 serves as a standard used to transfer EDI or other data. Advantages include:

  • End-to-end encryption
  • Ability to send/retrieve file transfers of any size or volume
  • Digital signature authentication for senders and receivers
  • MDN (Message Disposition Notification) alerts to verify messages were successfully received and decrypted
  • Validation of file integrity with confirmation of successful transfers

Related Reading: Which is Better: AS2 vs. SFTP?

What is AS3?

With the AS3 specification, applications communicate EDI data or other information using the FTP protocol. It’s not, however, just the latest and greatest edition of AS2. Rather, AS3 provides a layer of security for data transmission through digital signatures and data encryption.

Why Use AS3?

This specification offers flexibility, security and non-repudiation receipt (NPR), which gives the sender legal proof of unaltered delivery and verification that the message received is identical to what was sent. Other benefits include:

  • End-to-end data encryption
  • SSL encryption and hashing
  • Confirmation of receipts or MDNs
  • Proof of transaction details
  • Large file transfer capabilities
  • Ability to send any data type

What is AS4?

AS4, the latest option superseding AS2, is an open business-to-business (B2B) standard for securing and exchanging documents between businesses using web services.

Why Use AS4?

AS4 is frequently used for EDI integration projects. Other advantages include:

  • Used for both client and server (push and pull actions)
  • Receipts delivered as SOAP (Simple Object Access Protocol) messages with XML digital signatures
  • Payload agnostic
  • Combines MIME and SOAP for message packaging (AS2 is purely MIME-based)
  • Security based on WS-Security standard vs. AS2’s S/MIME specifications

Related Reading: Which is Better: AS2 vs. AS4?

From A to Z: GoAnywhere Glossary

Managed File Transfer Supports AS4, AS3 and AS2 File Exchanges

GoAnywhere MFT is a secure managed file transfer solution that simplifies, streamlines, audits, and automates file transfers across a variety of environments. It provides support for exchanging files via AS4 as well as AS3 and AS2. Using MFT with AS4/3/2 consolidates the whole transfer process and allows for single pane of glass administration as well as auditing capabilities.

GoAnywhere allows for customization of EDI documents. Users exchanging files with AS2 or AS4 will find this advantageous as many organizations use EDI for their internal integrations. Further, GoAnywhere MFT is both AS2- and AS4-certified by the Drummond Group, a third party certification party. This certification recognizes that GoAnywhere has met full interoperability testing, meaning you can rest assured that the information you exchange and receive is secured according to the relevant Applicability Statement standards.

Find out how easy integrating AS2, AS3 or AS4 can be with a secure managed file transfer solution in place at your organization when you download our white paper, How to To File Transfer the Right Way.

How to Do File Transfer the Right Way

Related Posts

Managed File Transfer: It's More than SFTP

Is Managed File Transfer just for SFTP file transfer automation? Contemplate this question with us here.

7 Benefits of Using MFT for Encrypted File Transfers

A managed file transfer (MFT) solution is overflowing with benefits. Take a look at 7 key encrypted file transfer advantages.

What is AS2? Common Protocol Explained

Ever wondered what AS2 is? Learn the key features, benefits & challenges of the AS2 Protocol along with an easy, Drummond Certified solution for stronger security and filename preservation.

What is Managed File Transfer?

As organizations continue to seek a secure file transfer solution for their rapidly growing data transfer needs, one question often arises above the rest: what, exactly, is managed file transfer (MFT)? Find out here.

Which is Better: SFTP vs. MFT?

SFTP or MFT file transfer solutions? That is the question. In this article, we compare secure FTP protocol solutions to MFT solutions to determine why an organization might need to choose one over the other.