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An introduction to rotation ciphers, nihilist ciphers, and transposition ciphers.
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Tabletop cryptography
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
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