@amoroso ... as is this - the woes of people destructively hacking in 1981 and how to stop them ...
"Doesn't it really burn you when some jerk logs into your remote CP/M system (that you've spent hundreds of hours and thousands of dollars to put on-line for public use) and promptly tries to steal you blind and crash or ruin your system?"
https://github.com/MITDDC/cpmarchive-1979-1984/blob/main/cpm/7007356/ar63.rcpm/secure.sysdoc