Findings:
- polyalphabetic substitution cipher
- Keyword substitution cipher
- substitution cipher
- monoalphabetic substitution cipher
- random key substitution cipher
- simple substitution cipher
- homophonic substitution cipher
- VIC cipher
- synonymous substitution
- rail fence cipher
- Dorabella Cipher
- substitution
- command substitution
- bifid cipher
- ADFGVX cipher
- Nihilist cipher
- Permutation cipher
- Hill cipher
- running key cipher
- Ideal cipher model
- Bacon Cipher
- Liskov Substitution Principle
- Adventures in text substitution
- YHWH declares that the substitution of LOVE with FUCK is punishable by AIDS; man responds by covering his member with plastic
- Fundamental substitution for trigonometric integration
- base substitution
- die substitution
- universal substitution
- Solving a system of equations by back substitution
- Marginal rate of substitution
- Substitution Effect
- synthetic substitution
- Turning grill transposition cipher
- Import Substitution
- Emergency Ingredient Substitutions
- Tritone substitution
- common integral substitutions
- Pigpen Cipher
- hybrid cryptosystem
- mechanical cipher system
- symmetric cipher
- asymmetric cipher
- Hash Cipher
- cipher alphabet
- transposition cipher
- Caesar shift cipher
- cipher text
- Stream Cipher
- null cipher
- Block cipher
- cipher (user)
- ERIKO-CHAN cipher
- cipher
- self-synchronizing stream cipher
- Additive Stream Ciphers
- synchronous stream cipher
- block cipher cryptanalysis
- Simon Singh's Code Book Cipher Challenge Cracked
- M209 Cipher Machine
- Playfair Cipher
- Soviet Espionage Cipher
- atbash cipher
- Caesar's Cipher
- The Beale ciphers
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