A single key can be shared across multiple hosts, in any event, each host should have at least one key. Each host can have multiple keys that are generated using different algorithms. When the OpenSSH-server package is installed, the host key is automatically generated and stored in /etc/ssh. Another SSH security feature that I find lacking in Windows is the concept of a host key. It then switches to symmetric encryption to bulk encrypt the TCP traffic between the client and the server using that key. SSH uses asymmetric encryption, which does not require a shared secret key to establish a shared secret key. Unlike Telnet, which does not encrypt client-server traffic, SSH traffic is fully encrypted, thereby making it the de-facto standard for accessing remote servers. The only port that needs to be opened on the server is Port 22, which is the default port assigned by the Internet Assigned Numbers Authority (IANA). It works just as well even when the servers are hosted in the cloud. Personally, I find WinSCP quite helpful as it allows me to transfer files back and forth from my Windows desktop machine to any of the Unix/Linux hosts that I manage. Those of you who work with Linux and Unix servers are quite familiar with open-source SSH tools such as Putty and WinSCP. The SSH server daemon allows users to securely connect to Linux and Unix servers using an SSH client. Having worked with Unix and Linux servers for a long time, one feature that I came to appreciate is the Secure Shell (SSH) daemon.
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