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Does anyone know better what it is and what is it for?
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This is part of the SSH key generation that is used for the system's fingerprint. The fingerprint is used when client SSH systems connect. Should the fingerprint change, the SSH client will warn users. A basic security precaution.
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My goal with this is to reduce in my slackware only packages that I use. So I always remove slowly what does not interest me.
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If this is a production system, then abga's caution is reasonable advice.
With respect to SSH, if this system is unique and never will be remotely accessed, then yes, the SSH package could be removed.
If this system will be a server, then certain package groups could be removed or not installed, such as /x, /xap, /kde[i]. If the system will be a server, the odds are overwhelming that one day remote access will be desirable and that means SSH.
If this system is not a production system then break away.
Just have fun exploring. There are several threads in this forum discussing "minimal installations" of Slackware.
A painless method is test various minimal installations in a virtual machine. Take a snapshot, remove some packages, and look for breakage. If the breakage is excessive, then restore the snapshot and begin again.