Cryptography challenge 101 (K-A)

• Introduction-notes (K-A)
• The discovery (K-A)
• Clue #2 (K-A)
• Clue #3 (K-A)
• Crypto checkpoint 1 (K-A)
• Clue #4 (K-A)
• Checkpoint (K-A)
• Crypto checkpoint 2 (K-A)
• Crypto checkpoint 3 (K-A)
• What's next? (K-A)