David Schuetz << DEF CON 16 Punch Card Puzzle >>CarolinaCon Flag Puzzle - Archived Comments DEF CON 16 Puzzle - Archived Comments Thu, Jul 28, 2011 - ∞ - def-con-16-punch-card-puzzle G. Mark July 28, 2011 at 11:18 am Well done! Congratulations on solving yet another G. Mark crypto puzzle (and thank you for taking the time to make such a detailed write-up.) – G. Mark