Filter by Category

Which is Better: AS2 vs. SFTP?

AS2 file transfers vs. SFTP file transfers

Over the last several months, we’ve compared many different file transfer protocols, including SFTP vs. FTPS and SFTP vs. MFT, and MFT vs. Dropbox for secure file sharing.

Today, we’re going to look at AS2 vs. SFTP. How do these popular file transfer protocols work? How do they differ? And most importantly, which one is better for your organization’s file exchange requirements?

Let’s dive in.

What is AS2?

AS2 stands for Applicability Statement 2. Originally, Applicability Statement was created in the 1990s as AS1. It was later upgraded when Walmart adopted and required their suppliers and other third-party vendors to use it in 2002. The upgrade included the encryption of messages, known as AS2 messages, that were exchanged with trading partners, vendors, and remote systems using a secure HTTPS connection. AS2 remains very popular among retail organizations, especially those that detail with e-commerce, today.

AS2 employs two security methods to protect sensitive information in transit: digital certificates and industry-level encryption standards. All AS2 messages exchanged over HTTPS are compressed and signed before they’re transmitted via a secure SSL tunnel.

When compared to secure file transfer protocols like FTPS and SFTP, AS2 has a feature that makes it unique: it allows users to request a Message Disposition Notification (MDN), also known as a receipt, that alerts the sender once the message has been received and decrypted by the recipient. This receipt (also called an NRR, or non-repudiation of receipt) is created, signed, and returned to the sender after decryption, giving them legal proof that the file was delivered without being altered in transit.

What is SFTP?

SFTP stands for FTP over SSH. It is a secure FTP protocol, which means SFTP is an excellent alternative to unsecure FTP tools or manual scripts. SFTP exchanges data over a secure shell (SSH) connection and provides organizations with a high level of protection for file transfers shared between their systems, trading partners, employees, and the cloud.

For encryption, SFTP supports AES, Triple DES, and similar algorithms like Blowfish. For authentication, organizations that implement SFTP can test a connection using a user ID and password, an SSH key, or a combination of an SSH key and password. Many SFTP solutions, including GoAnywhere MFT, support dual factor authentication for higher security.

When to Choose AS2 vs. SFTP

So, when should you choose AS2 or SFTP for file transfers? Here are some considerations:

Choose AS2 if…

Choose AS2 if a) you are a retail or e-commerce organization or b) you need an easy way to meet regulatory compliance requirements and trading partner needs. Synchronous or asynchronous MDN receipts, especially, help prove that file transfers have been received and decrypted successfully—and by the right person.

AS2 also offers benefits like:

  • End-to-end file encryption
  • Validation of file integrity with successful transfer confirmation (non-repudiation)
  • Ability to send or retrieve files of any size or volume

AS2 software can also be Drummond Certified. Drummond Certified is a label that Drummond Group, a third-party certification organization, gives to any solution that can prove interoperability between AS2 vendors. The certification is extensive and ensures that the solution you use will allow you to integrate with your AS2 trading partners.

In order to achieve certification, the solution’s vendor must conduct thousands of AS2 protocol test scenarios successfully. This process uses full matrix interoperability testing between AS2 vendor solutions to verify that important transfers maintain their security and integrity as they are exchanged across secure internet connections.

Choose SFTP if…

The rest of the business world tends to prefer SFTP over AS2. Choose SFTP if you need strong authentication and firewall options. With SFTP, you can use a user ID and password or use SSH keys with (or in place of) passwords to authenticate a server-to-server connection.

While authentication with SSH keys requires you to generate SSH key pairs, secure file transfer solutions like GoAnywhere offer key and certificate management systems (often abbreviated as KMS) alongside a SFTP client or server to help keep the organization’s SSH keys secure, organized, and stored in a central location.

SFTP is also easy to implement. Since it’s a firewall-friendly protocol, it only needs one port opened (usually port 22) to send initial authentication requests, issue commands, and exchange information between your organization and another server.

Many secure file transfer solutions on the marketplace today, like GoAnywhere Managed File Transfer, offer SFTP and other SFTP-supporting features, including file transfer automation, activity tracking, and monitoring, that make it easier for organizations to transfer files simply, securely, and affordably.

Secure Your File Transfers with AS2 or SFTP

GoAnywhere Managed File Transfer (MFT) is a secure file transfer solution from HelpSystems. GoAnywhere supports SFTP, FTPS, AS2, and other secure industry protocols for file sharing.

If you’re ready to start sending secure, encrypted file transfers between your organization and your trading partners, employees, and clients, we can help! See if GoAnywhere MFT is right for your organization’s file transfer needs by taking a short feature tour.

Take a Feature Tour

Latest Posts


Everything You Need to Know about PGP Encryption

June 25, 2019

What is PGP? PGP, or Pretty Good Privacy, is one of the most popular encryption methods used today. It is used by banks, financial institutions, healthcare organizations, and other highly regulated…


Automation Operations: 5 Benefits of Automation

June 25, 2019

Advantages of Automation Visions of a mechanized world flourished long before the term “automation” was coined. The star of Westinghouse’s exhibit at the 1939 World’s Fair was Electro,…


6 Ways to Get Internal Buy-In for Your MFT Solution

June 21, 2019

There are a lot of moving pieces that go into a product evaluation. You need to navigate through the myriad of options in today's marketplace, attend vendor demonstrations, try the software in a test…


What is a DMZ and Why Do You Need a DMZ Gateway?

June 19, 2019

If you’ve watched a science-fiction movie about space travel, then you’ve likely seen some version of a scene in which an astronaut reenters their ship from the outside abyss. Because the ship…


Eight Hacks You Can Implement to Combat "Hackable" Network Vulnerabilities

June 18, 2019

Although we’re becoming savvier to the tricks hackers have pulled in the past, they are still working to up their game and catch us where and when we least expect it. Fortunately, there are some…