Secure File Transfer Tools: SFTP, FTPS, and MFT Solutions

Organizations exchange sensitive files with partners, clients, and vendors every day. Financial records, healthcare data, legal documents, and proprietary business information routinely move between organizations through file transfer mechanisms. Using insecure transfer methods exposes this data to interception, tampering, and unauthorized access. Secure file transfer tools encrypt data in transit and often at rest, authenticate both parties, log all transfer activity, and enforce access controls to protect sensitive files throughout the transfer lifecycle.

Understanding Secure Transfer Protocols

SFTP, the SSH File Transfer Protocol, operates over an SSH connection and provides encrypted file transfer with strong authentication. It uses a single port (typically port 22) which simplifies firewall configuration, encrypts both the command channel and data channel, and supports key-based authentication that eliminates password exposure. SFTP has become the most common secure file transfer protocol for automated system-to-system transfers.

FTPS adds TLS/SSL encryption to the traditional FTP protocol. It supports both explicit mode, where the client requests encryption after connecting, and implicit mode, where the connection is encrypted from the start. FTPS can be more complex to configure than SFTP due to its use of multiple ports for data connections, but it provides compatibility with existing FTP infrastructure and workflows.

SCP, Secure Copy Protocol, transfers files over SSH with encryption but lacks the interactive file management features of SFTP. It is useful for simple scripted file copies but is being superseded by SFTP in most use cases.

HTTPS-based file transfer uses web interfaces or APIs protected by TLS encryption. Many modern managed file transfer platforms provide browser-based upload and download interfaces secured by HTTPS, making secure file sharing accessible to non-technical users who are not familiar with SFTP clients.

Managed File Transfer Platforms

Managed file transfer solutions add governance, automation, and visibility on top of secure transfer protocols. They provide centralized management of all file transfer activity, automated workflows that trigger transfers based on schedules or events, detailed audit logging for compliance, and administrative controls over who can transfer what files to which destinations.

GoAnywhere MFT provides a comprehensive managed file transfer platform with support for SFTP, FTPS, HTTPS, AS2, and other protocols. It includes a visual workflow designer for building automated transfer processes, secure mail for sending encrypted files to external recipients, and detailed audit logging. GoAnywhere supports on-premises, cloud, and hybrid deployments.

Globalscape EFT is an enterprise managed file transfer server that combines secure file transfer with advanced security features including data loss prevention, content inspection, and integration with antivirus scanning. Its web transfer module provides browser-based file sharing that does not require recipients to install software.

Axway SecureTransport provides enterprise-grade managed file transfer with support for high-volume transfer environments. It includes built-in data loss prevention, file encryption at rest, and integration with security information and event management systems. Axway is commonly deployed in financial services and healthcare where compliance requirements are stringent.

Progress MOVEit is widely used in healthcare, financial services, and government for secure file transfer. It provides automated workflows, detailed audit trails, and compliance reporting for regulations including HIPAA, PCI DSS, and GDPR. MOVEit offers both on-premises and cloud-hosted deployment options.

Choosing the Right Approach

Small teams with occasional secure transfer needs may find that a simple SFTP server or encrypted email solution meets their requirements without the complexity of a full MFT platform. Open-source SFTP servers like OpenSSH provide robust secure transfer capabilities at no cost.

Organizations that regularly exchange files with multiple external partners benefit from MFT platforms that centralize management, automate workflows, and provide the audit trail needed for compliance reporting.

High-volume transfer environments where reliability, monitoring, and automated error handling are critical need enterprise MFT solutions that provide clustering, failover, and detailed transfer monitoring.

Security Best Practices

Use key-based authentication for SFTP rather than passwords whenever possible. SSH keys are significantly more resistant to brute force attacks than passwords and cannot be phished. Rotate keys periodically and revoke keys immediately when personnel changes occur.

Encrypt files at rest on the transfer server, not just in transit. Files that sit on a transfer server between upload and download are exposed if the server is compromised. At-rest encryption ensures that even a server breach does not expose file contents. For additional guidance on file security, see our Secure File Sharing Guide.

Implement the principle of least privilege for transfer accounts. Each partner or automated process should have access only to the specific directories they need. Broad access permissions allow a compromised account to access files belonging to other partners.

Monitor transfer activity for anomalies. Unusually large transfers, transfers at unexpected times, or transfers to new destinations may indicate account compromise or data exfiltration. Integration with your SIEM enables correlation of transfer activity with other security events.

Disable legacy protocols. FTP without encryption transmits credentials and file data in cleartext. If legacy FTP is still in use, prioritize migration to SFTP or FTPS. The transition typically requires updating connection configurations on both ends and testing to verify compatibility.