In an era where data security is crucial, understanding the robustness of our data transfer protocols is paramount. As businesses prioritize effective reporting, analysis, and insight gathering, the Extract, Transform and Load (ETL) process plays a pivotal role. This process gathers data from various sources, aiming to store it securely, often in a data warehouse. One method, Secure File Transfer Protocol (SFTP), has been an industry standard for over two decades. But just how reliable is it in safeguarding your business data? Let's delve deep into the intricacies of SFTP.

Here are the five key takeaways from the article:

  • SFTP Overview: Evolved from FTP, SFTP offers enhanced encryption through the SSH protocol.
  • Advantages of SFTP: It stands out for its versatility in business scenarios, offering layered security and ensuring compliance.
  • SFTP Security: Utilizing AES encryption and SHA-2 hashing, it underscores that human diligence remains essential for achieving optimal security.
  • SFTP and ETL Integration: Provides seamless and secure data integration, even for sources without preset connectors.
  • Recommendation: A cloud-based ETL solution supporting SFTP can be the key to secure and efficient data management.

In this article, we explore if SFTP truly lives up to its reputation as a secure solution that many businesses trust.

Table of Contents

  1. What is SFTP?
  2. Advantages of SFTP
  3. How Secure is SFTP? The Secure File Transfer Protocol
  4. SFTP and ETL
  5. How Can Help

What is SFTP?

SFTP is the evolved, more secure counterpart of FTP. FTP, or "File Transfer Protocol", was the de facto method to transfer files between clients and servers from the 1970s to the 1990s. SFTP came into existence in the 1990s, with the “S” representing its secure nature due to the encryption involved in every transfer.

Unlike FTP, SFTP operates over the SSH protocol, which supports secure remote login. This ensures more secure file transfers by offering numerous options for strong authentication during digital communication.

Further Reading: What is the Difference Between FTP and SFTP?

Advantages of SFTP

SFTP's prominence isn't just due to its security but also its adaptability and versatility in various business scenarios. Companies might need to meet certain compliance standards, and SFTP can be pivotal in achieving this. Some of the distinct advantages of SFTP include:

    • SFTP uses a single channel for digital communication whereas other protocols use multiple channels
    • The underlying SSH protocol includes layers of different types of security
    • These layers include data encryption, data integrity protective services, and server authentication
    • Authentication can occur via user-defined private security keys or alphanumeric usernames and passwords
    • There is wide support across operating systems and apps for SFTP
    • SFTP meets most data governance and regulatory compliance requirements

    SFTP is the preferred data transfer protocol for many reasons. Wholesalers and retailers can safely transfer whole swathes of information about shipping and purchase orders using SFTP. SaaS applications often transfer information between one another via SFTP. And, as we’ll see later on, SFTP can be an integral part of an ETL solution to merge and integrate data effectively while keeping it encrypted and secure.

    How Secure is SFTP? The Secure File Transfer Protocol:

    With "secure" right in its name, SFTP naturally raises expectations. But just how secure is SFTP in real terms? The answer is — thankfully — very secure.

    If a cybercriminal intercepts data that is being transferred by SFTP, it won’t do them any good. The layered encryption on the data will render it virtually useless. SFTP, or more accurately the SSH protocol beneath, uses the Advanced Encryption Standard, or AES, to encrypt your data. This symmetrical block cipher uses a mathematical process involving prime numbers to encrypt data with a specific key. The goal is that the system only provides the correct key once the data is safely in the hands of the intended recipient.

    SFTP also has a way to ensure data integrity, or more reassuringly, to alert data recipients if external interference has altered the data in any way. A hashing algorithm called SHA-2, also provided by SSH, processes the data in such a way that it creates a particular letter/number combination called a "hash." Once a successful data transfer has occurred, the hashing algorithm runs again, and the recipient should see that the system produces exactly the same hash. If a different hash appears, it indicates that something happened to the data during its journey.

    SFTP users can also set their own usernames and passwords or particular security keys. These only work, of course, if companies train their employees not to disclose passwords or write them down, or even store them on a shared computer. It's also crucial to ensure that employees and data managers use strong passwords, and that they change these passwords regularly or assign them a single-time use.

    Companies should also avoid default passwords and adopt a password centralization process that allows data managers to adjust passwords as necessary — for example, when an employee leaves the company or changes roles. Human interaction with data is a primary factor in keeping it as secure as possible. In fact, it’s this human interaction that causes most of the potential security concerns when it comes to the question: How secure is SFTP?

    If someone takes the transferred data and moves it forward again, SFTP can’t prevent this — but nor can any other file transfer security protocol. Some companies may need additional data security features in place to prevent the unauthorized transfer of files, especially if they need to comply with stringent data security regulations such as Europe's General Data Protection Regulation (GDPR). Keeping manual logs of data transfers may also be necessary, as SFTP doesn't automatically log a central document of every transfer on a particular network.

    SFTP also only encrypts data in transit, so data managers and engineers must ensure that stored sensitive data, such as personally identifiable information (PII) has the relevant encryption required to meet industry regulations. This would be necessary regardless of the data transfer protocol used, or even if the data were static.

    SFTP and ETL

    It’s clear that when you’re transferring data across networks, SFTP is a simple and secure solution. That’s what makes it such a useful tool for effective data integration. Merging all your business’s data into a single destination allows you to generate the fastest and most operational analysis and reports, so it’s critical that you can connect — without drama — to a range of data sources.

    Many of these sources will have other connectors, such as APIs, that allow your ETL tool to communicate and draw out the data required with ease. Examples of these services include Salesforce and other CRM services, or marketing services such as Google Ads or Facebook Ads. But not all data sources come with pre-built connectors or APIs.

    With SFTP, this isn’t an issue. For companies that don’t currently have a service that provides SFTP connections, it’s possible to set up your own SFTP server, then run commands to tell the server exactly what to connect to and what data you need. Whatever connections you make, you'll have peace of mind from knowing that all your business data is coming together and is always secure in transit.

    How Can Help

  is a no-code, cloud-based ETL solution that’s completely scalable and elastic. Fully supporting SFTP, offers businesses a secure avenue to manage and consolidate their most critical data. With pre-built connections to numerous data stores and SaaS platforms, businesses can create the optimal data pipelines to harness their data's true potential.

    Contact us to find out more and to try our 14-day demo.