A network protocol for securely transferring files between computers, SCP is similar to FTP but uses a secure encrypted connection. This makes it more secure than FTP. It is commonly used to transfer files between servers and to securely transfer sensitive data, such as financial or personal information. Many operating systems support SCP, and it is often used alongside other protocols, such as SSH and SFTP, to provide secure remote access and file transfer capabilities.
How SCP Works
SCP operates by establishing an encrypted connection between the local and remote hosts using the Secure Shell (SSH) protocol. The scp command-line tool is used to specify the source and destination files, as well as the hostname or IP address of the computer involved in the transfer. This ensures that the data being transferred is protected from interception and tampering.
SCP vs. Modern Alternatives
According to OpenSSH developers in April 2019, SCP is outdated, inflexible, and not readily fixed. They recommend using more modern protocols like SFTP and rsync for file transfers. As of OpenSSH version 9.0, the scp client uses SFTP for file transfers by default instead of the legacy SCP/RCP protocol.
Use Cases for SCP
- Server-to-server transfers: SCP is commonly used to transfer files between servers, ensuring that sensitive data is protected during the transfer.
- Secure data transfer: It is ideal for transferring sensitive information, such as financial or personal data, between computers.
- Remote access: SCP is often used in conjunction with SSH and SFTP to provide secure remote access and file transfer capabilities.
Tools for Using SCP
- Command line tools: The scp command is available on Linux and macOS systems.
- Third-party clients: Various third-party SCP clients are available for different operating systems, providing a graphical user interface for easier file transfers.