Description: A secure connection established using SSH (Secure Shell) allows users to remotely access and manage computer systems over an insecure network. SSH provides a secure channel over an insecure network by using encryption techniques, ensuring the confidentiality and integrity of transmitted data. This technology is fundamental for remote management, as it enables administrators to execute commands, transfer files, and perform configurations without being physically present at the location. Additionally, SSH authenticates users using cryptographic keys or passwords, adding an extra layer of security. The SSH connection is typically established through port 22 by default, although it can be configured to use other ports. Its use has become standard in the management of various operating systems, including Linux and Unix, and is widely adopted in development and production environments. The ability to create SSH tunnels also allows users to securely redirect network traffic, further expanding its functionality. In summary, SSH is an essential tool for the security and remote management of systems, providing a reliable and secure means of communication over potentially vulnerable networks.
History: SSH was created by Tatu Ylönen in 1995 in response to the need for a secure way to access remote systems. The first version, SSH-1, was released that same year but had some vulnerabilities. In 1996, SSH-2 was published, which improved security and functionality. Since then, SSH has evolved and become a de facto standard for remote system management, being adopted by various operating systems.
Uses: SSH is primarily used for remote server administration, allowing administrators to execute commands and manage systems without physical access. It is also used for secure file transfer via SCP (Secure Copy Protocol) and SFTP (SSH File Transfer Protocol). Additionally, SSH allows for the creation of secure tunnels to redirect network traffic, which is useful for accessing restricted services or securing insecure connections.
Examples: A practical example of using SSH is a system administrator connecting to a remote server to apply software updates. Another example is a developer using SFTP to securely transfer source code files to a production server. SSH can also be used to establish a secure tunnel that allows access to a database that is behind a firewall.
