Question about ssh_host_dsa_key

[Robert Dailey]

Hi,

I'm very new to Ubuntu Server and I'm just wondering what the key named
"ssh_host_dsa_key" is for? This is located in /etc/ssh. Also another
confusing concept is ssh-keygen. What's the point of creating public/private
keys? Is this so I never need to specify an explicit password when logging
into my ubuntu server via PuTTY on windows? I'm trying to understand how SSH
works in Ubuntu so I can debug an issue I'm having with svn over ssh.

Thanks.
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