Codebusters

15 topics, in order. Each one builds on the ones before it.

1. 1Letter Frequency Analysis and Basic Cryptanalysis Concepts
2. 2Caesar/Shift Cipher and Atbash Cipher
3. 3Aristocrat Solving Techniques
4. 4Patristocrat Solving Techniques
5. 5K1 Alphabet Construction and Keyword Recovery
6. 6K2 and K3 Alphabet Construction
7. 7Xenocrypt: Spanish Frequency and Common Patterns
8. 8Baconian Cipher Decoding
9. 9Porta Cipher: Table Use and Crib-Based Cryptanalysis
10. 10Columnar Transposition Grid Reconstruction
11. 11Nihilist and Checkerboard (Polybius) Ciphers
12. 12Fractionated Morse Cipher Decryption
13. 13Homophonic Cipher Decryption
14. 14Cryptarithm Solving with Constraint Propagation
15. 15Exam Strategy: Timing, Bonus Selection, and Error Management