I have a vague memory of reading his book (or a similar account). The one specific thing I remember is a philosophical rant about how you can never be sure that

I have a vague memory of reading his book (or a similar account). The one specific thing I remember is a philosophical rant about how you can never be sure that a hacker will leave a trace within the digital inner world of a computer that they control. For example log files can be edited to remove suspicious activity. So he set up the system so it would log straight to a printer. Much harder to redact paper logs. :)