The document discusses tabletop cryptography. It begins with an introduction of the author and then covers terms, the history of selected ciphers like rotation ciphers and transposition ciphers, and provides examples of ciphers like the Vigenere cipher, route cipher, and VIC cipher. The examples demonstrate how each cipher works by providing plaintext, keys, and resulting ciphertext.

1. Tabletop Cryptography
Frank Cash

2. Who Am I?
● https://frankcash.github.io/
● Twitter: @hackthethings
● Github: @frankcash

3. Tabletop Cryptography
● Terms
● History of Selected Ciphers
● Example Ciphers

4. Tabletop Cryptography
● Terms
● History of Selected Ciphers
● Example Ciphers

5. Terms
● Plaintext
● Cipher
● Ciphertext

6. Tabletop Cryptography
● Terms
● History of Selected Ciphers
● Example Ciphers

7. History of Selected Ciphers
● Rotation Ciphers
● Transposition Cipher
● Nihilist Ciphers

8. Rotation Ciphers
● Not the First Cipher Used
● Used by Caesar
● Common Sub-Cipher

9. Transposition Cipher
● Scytale Used by Greeks
● Used During Civil War
● Strengthens Weak Ciphers

10. Nihilist Ciphers
● Symmetric Encryption
● Russian Nihilists (1880s)
● Soviet Spies (WWII - Cold War)

11. Tabletop Cryptography
● Terms
● History of Selected Ciphers
● Example Ciphers

12. Example Ciphers
● Vigenere Cipher
● Route Cipher
● VIC Cipher

13. Vigenere Cipher
● Complex Substitution Cipher
● Builds on Caesar Shift
● Commonly Used in CTFs
● Utilizes a Key

14. Vigenere Cipher
● Utilize Vigenere Table
● Encrypting: Row (Plaintext) -> Column
(Key) = Ciphertext
● Decrypting: Column (Key) -> Row
(Ciphertext) Output = Plain(text)
Vigenere Table

15. Vigenere Cipher
● Plaintext: A Game. A Movie Star.
● Key (Repeats): Pragyan
● Ciphertext: p xasc. a zdmik qtng.
Vigenere Table

16. Route Cipher
● Belongs to Transposition Family
● Lots of Possible Keys

17. Route Cipher
● Plaintext: attack at dawn. hello world.
● Key: Descending Vertical Column.
● Ciphertext: akwll tanod tthwq adeoq calrq

18. VIC Cipher
● Belongs to Nihilist Ciphers
● Used by PoWs in Vietnam
● Regarded as Most Complex Hand Cipher
● Checkerboard Transposition

19. VIC Cipher
● Plaintext: Attack at dawn
● Ciphertext: 03-01-01-03-21-27
03-01 22-03-65-05
Straddling Checkerboard

20. Tabletop Cryptography
● Terms
● History of Selected Ciphers
● Example Ciphers

21. Tabletop Cryptography