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What is a host key in computers?

Updated: 11/5/2022
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A host key is used by a server to prove its identity to a client and by a client to verify a "known" host. Host keys are described as persistent (they are changed infrequently) and are asymmetric-much like the public/private key pairs discussed above in the Public key section. If a machine is running only one SSH server, a single host key serves to identify both the machine and the server. If a machine is running multiple SSH servers, it may either have multiple host keys or use a single key for multiple servers.

The Host key is a password set by you and acts as the computer's unique access code. It is stored only on your machine and not on the RemotePC servers.

SSH automatically verifies that the host is authentic by comparing the host key in a local database against what the host sends when you connect.

There are two places where the host key is kept. There is a master host key database and a personal host key database. The master host key database is created by ECN with all of the ECN hosts already populated and is satisfactory for most situations. The personal database stores additional host keys when you communicate with a host not supported or outside of the ECN network.

Related links :-

http://www.remotepc.com/index.html

http://en.wikipedia.org/wiki/Secure_Shell

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