Findings:
- mechanical cipher system
- cipher
- cipher text
- substitution cipher
- monoalphabetic substitution cipher
- Caesar shift cipher
- simple substitution cipher
- homophonic substitution cipher
- polyalphabetic substitution cipher
- transposition cipher
- cipher alphabet
- asymmetric cipher
- symmetric cipher
- hybrid cryptosystem
- Pigpen Cipher
- Hash Cipher
- The Beale ciphers
- Caesar's Cipher
- atbash cipher
- Soviet Espionage Cipher
- Playfair Cipher
- M209 Cipher Machine
- Simon Singh's Code Book Cipher Challenge Cracked
- Stream Cipher
- synchronous stream cipher
- Additive Stream Ciphers
- self-synchronizing stream cipher
- Turning grill transposition cipher
- ERIKO-CHAN cipher
- cipher (user)
- Block cipher
- null cipher
- block cipher cryptanalysis
- Bacon Cipher
- Keyword substitution cipher
- Ideal cipher model
- running key cipher
- Hill cipher
- Permutation cipher
- random key substitution cipher
- Nihilist cipher
- ADFGVX cipher
- bifid cipher
- VIC cipher
- rail fence cipher
- Dorabella Cipher
- windowing system
- Operating system
- X Window System
- file system
- Bulletin Board System
- System
- Elephant Memory Systems
- Systems Administrator
- Online Systems Services, Inc.
- limitations of the system
- Sound Systems
- Essential System Administration
- Emergency Brain-Dump System
- Global System for Mobile communications
- metric system
- Two-party system
- Honor system
- solar system
- HERO System
- systems music
- value system
- systems engineer
- Computational and Neural Systems
- Microsoft Certified Systems Engineer
- rating system
- System management
- immune system
- imperial system
- retinal imaging
- systems engineering
- Domain Operating System
- System 7
- public transit system
- system call
- Geographic Information System
- extended nervous system
- single system image
- system engineer
- General Systems Theory
- complement system
- Nintendo Entertainment System
- Super Nintendo Entertainment System
- nervous system
- circulatory system
- belief system
- Disk Operating System
- Biological system of classification
- central nervous system
- roleplaying game system
- Fountain pen filling system
- hypertext systems
- writing system
- Master System
- The buddy system
- Feudal System
- decimal system
- Computer naming system
- Dewey Decimal System
- MIU
- TNT system
- Hynek Classification System
- lymphatic system
- Advanced Photo System
- Reproductive System
- digestive system
- Catholic indoctrination resides in the limbic system
- limbic system
- magnetic guidance systems
- University System of Maryland
- Public Address system
- Sienar Fleet Systems
- Two party system
- Ptolemaic system
- Copernican system
- Endocrine system
- System 5
- System 6
- object oriented database systems
- expert system
- fringe operating systems
- Nielsen Ratings System
- The good thing about using a horribly outdated file system
- Emergency Broadcast System
- Eisenhower Interstate System
- Distributed system
- Integrated Court System
- Parallel Court System
- file system checker
- confederated systems
- System 16
- Linux-based operating system
- Symbolic Systems
- weapons systems
- root system
- Xerox Network Systems
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