In OpenSSH, the collection of known host keys is stored in /etc/ssh/known_hosts and in. These stored host keys are called known host keys, and the collection is often called known hosts. SSH clients store host keys for hosts they have ever connected to. The ssh-keygen program can be used for generating additional host keys or for replacing existing keys. Host keys are normally generated automatically when OpenSSH is first installed or when the computer is first booted. In OpenSSH, host keys are usually stored in the /etc/ssh directory, in files starting with ssh_host_key (the location can be changed in server configuration files).
However, in computing clusters sharing hosts keys may sometimes be acceptable and practical. Sharing host keys is strongly not recommended, and can result in vulnerability to man-in-the-middle attacks. Contents Host Keys Should Be Unique Host Keys in OpenSSH Known Host Keys Management of Host Keys Host Certificates User Keys Tools for SSH Host Key Management Host Keys Should Be UniqueĮach host (i.e., computer) should have a unique host key.
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