Damn, RIP PGN, the Sean Connery of computer security. I learned a number of valuable lessons about composability from Peter (voting systems are hard). He was always asking shrewd, careful questions, like a bright ray of sunshine.
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@joebeone I'm having a hard time imagining what we will do without him. And I mean not just his deep professional wisdom, but his wit, his bad puns, his musical talent, and his reminders that Multics did it first and better.