Overview
Secure Shell (SSH) is a network security protocol. Using encryption and authentication, SSH implements remote login and file transfer securely over an insecure network.
SSH uses the typical client/server model, establishing a channel to protect data transfer based on TCP.
SSH includes two versions: SSH1.x and SSH2.0 (hereinafter referred to as SSH1 and SSH2), which are not compatible. SSH2 is better than SSH1 in performance and security.
The device can not only work as an SSH server to provide services to SSH clients, but can also work as an SSH client to allow users to establish SSH connections with a remote SSH server. When acting as an SSH server, the device supports SSH2 and SSH1 in non-FIPS mode, and supports only SSH2 in FIPS mode. When acting as an SSH client, the device supports SSH2 only.
The device supports the following SSH applications:
Stelnet—Provides secure and reliable network terminal access services. Through Stelnet, a user can log in to a remote server securely. Stelnet protects devices against attacks such as IP spoofing and plain text password interception. The device can act as both the Stelnet server and Stelnet client.
SFTP—Based on SSH2, SFTP uses the SSH connection to provide secure file transfer. The device can serve as the SFTP server, allowing a remote user to log in to the SFTP server for secure file management and transfer. The device can also serve as an SFTP client, enabling a user to log in from the device to a remote device for secure file transfer.
SCP—Based on SSH2, SCP offers a secure method for copying files. The device can act as the SCP server, allowing a user to log in to the device for file upload and download. The device can also act as an SCP client, enabling a user to log in from the device to a remote server for secure file transfer.