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What is the difference between FTP and SFTP?
File Transfer Protocol (FTP) and SSH File Transfer Protocol (SFTP) are both protocols used for transferring files between systems, but they differ significantly in security, architecture, and functionality.
FTP (File Transfer Protocol)
FTP is a standard internet protocol that operates over TCP/IP for transferring files between hosts. It establishes two separate connections for operation:
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Control Connection − Initiated by the client to port 21 on the server. This connection handles authentication, commands, and session management.
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Data Connection − Created on-demand (typically port 20) for actual file transfers. Multiple data connections can be opened and closed during a single FTP session.
The major limitation of FTP is that it transmits data and credentials in plain text, making it vulnerable to interception and security threats.
SFTP (SSH File Transfer Protocol)
SFTP operates over the SSH (Secure Shell) protocol, providing secure file transfer capabilities. Unlike FTP, SFTP uses a single encrypted connection on port 22, ensuring that both data and credentials are protected during transmission.
Key advantages of SFTP include:
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Encryption − All data, commands, and authentication are encrypted
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Single Port − Uses only port 22, simplifying firewall configuration
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File Permissions − Better control over file ownership, permissions, and properties
FTP vs SFTP Comparison
| Feature | FTP | SFTP |
|---|---|---|
| Security | Plain text transmission | SSH encrypted transmission |
| Port Usage | Port 21 (control) + Port 20 (data) | Port 22 only |
| Connections | Two separate connections | Single SSH connection |
| Authentication | Username/password (plain text) | SSH keys or encrypted credentials |
| File Operations | Basic file transfer | Advanced file permissions and symbolic links |
| Firewall Configuration | Complex (multiple ports) | Simple (single port) |
Common Use Cases
FTP is suitable for internal networks where security is not a primary concern, such as transferring files within a trusted local network environment.
SFTP is preferred for internet-based file transfers, automated backups, and any scenario where data security and integrity are critical requirements.
Conclusion
While FTP remains useful for simple internal file transfers, SFTP is the recommended choice for secure file operations due to its encryption, simplified port management, and enhanced security features. SFTP effectively addresses the security vulnerabilities inherent in traditional FTP.
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