In the Arctic product line, SSH-VPN is a vendor-specific VPN which uses SSH public-key cryptography for securing the VPN traffic. The current product portfolio of ABB Arctic devices supports SSH v.2 which is considered safe within the contemporary cybersecurity standards.
The earlier versions of Arctic devices used SSH version 1 keys. Since several vulnerabilities were found in SSH v.1, the protocol is nowadays considered unsafe from the cybersecurity point of view. Thus, it is recommended to use the SSH key update tool for ABB ARM600 M2M Gateway to update any existing SSH-VPN v.1 key to v.2. The tool can also be used to update an existing SSH v.2 key to a new one, for example, by changing the key size from 2048 to 4096.