Do ssh keys expire?

[J.Witvliet at mindef.nl]

There is a patch on the net, so you can ssl-certificates (and appropriate keys)

Afaicr, that code is also included in the commercial version of ssh.


From: "David Fletcher" <dave at thefletchers.net<mailto:dave at thefletchers.net>>
Date: Tuesday, 19 August 2025 at 12:40:35 pm
To: "ubuntu-users at lists.ubuntu.com" <ubuntu-users at lists.ubuntu.com<mailto:ubuntu-users at lists.ubuntu.com>>
Subject: Re: Do ssh keys expire?

Robert,

I thank you for this clarification.

On Tue, 2025-08-19 at 05:42 -0400, Robert Moskowitz via ubuntu-users
wrote:
> SSH keys are "Raw Keys".  That is there is little meta data
> associated with them (e.g. your SSH key ID).  They exist by
> themselves.
>
> These sorts of keys never "expire".  It is up to the owner as to when
> they decide to replace them.

This is what I have always assumed, but being (to the annoyance of many
over the last couple of decades!) a Linux evangelist who knows how to
set up postfix, dovecot, IPv4, IPv6, DNS, OpenWRT etc. to his own
satisfaction but doesn't understand the inner workings of all the
security protocols I just wanted to ask for confirmation.

My son, who would have been 12 or 13 years old at the time, also made
his own ssh keys on a Linux box at about the same time as I did and is
now using the same keys on his macbook and mac mini to access my home
server.

Thanks and regards to all in the community.

Dave Fletcher

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