Challenges: (ranked roughly from easiest to hardest)

• put user in a python shell, have them try to read the flag from a file
• 2l.sh - read flag from a file using only 2-letter shell commands
• approved.pl - read flag from file using only the commands ls, pwd, whoami
• squeal.sh - perform an SQL injection attack to read the secret flag from the flags table
• patience.c - find the code from a binary executable that will print the solution in 1 year's time

Make sure there is a different flag for each challenge.