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Admin
Worst algorithm: when n-password-uniqueness (preventing immediate change back) is too complex, you just use a minimum pw lifetime for the same result. Then a user making an error like setting the same password as for another account, can't repair it without help from IT. And IT has gone home already, or has more important stuff to do, and at least scolds the user for needing help => the error won't be repaired.
Admin
shit, that's how I get my password. Now I have to come up with a new algorithm
Admin
Security by obscurity of algorithm. If you don't know the algorithm, then you can't access the server. Once you know the algorithm, there is no way to secure the system from you, by like changing the password, even if you are no longer (or never were) authorized to work on that server in that way.
Admin
On your last day there just enable DHCP
Admin
Great to learn Paula stayed in IT, after all. :-)
Admin
Servers are typically static IP's for just that reason. They don't freaking change on you.
Admin
Yeah, how else are you going to keep that password so ironclad secure?
Admin
Notice he said "on your last day..."
Admin
So what is he going to enable? The DHCP Server itself? The network immediately collapses and is fixed. The first in line switches? The Network immediately collapses and is fixed. At each device (server) ? Would kill that server only. Might be somewhat pranky if he chose a single rarely accessed server and nobody noticed for awhile. Real-time servers? Immediate Application(s) collapse and fix. So what's the stupid point in trying to do anything via DHCP. Precisely.
Admin
DHCP has the option to provide static IP by MAC address. So nothing will change visibly, until some server or at least network interface has to be replaced.
Admin
DHCP? Why wouldn't you use DHCP and reserve the IP addresses anyway? You instantly have the IP addresses documented without resorting to spreadsheets or the like.
Admin
Oldschool sysadmins are frightened by DHCP. It's a shame, but doing things the hard way at least justifies a lot of wailing and whining that such people probably are inherently going to do anyway.
Admin
Hey I got an idea! Let's add two-factor authentication to that system so it will be even more secure.
We can print up a bunch of business cards with a random six-digit number on them. Then, the server logins can prompt for that number.
Something you know and something you have, right? Two factor. Perfect. And MUCH cheaper than FIDO keys for everybody.
Actually, it's three factor. Something you know, something you have, and something you are. You must be stupid to log in this way.