Binary & Encryption Flashcards
Name 3 binary systems
Unicode, ASCII, Baudot
How many bits and characters does Unicode support
Unicode supports 16 bits and 65 536 possible characters
How many bits and characters does ASCII support
ASCII supports 7 bits and 128 possible characters
How many bits does Baudot support
Baudot supports 5 bits and 32 possible characters
What is encryption
Encryption is the process of converting data to cypher text that’s only understood if you know the key
What is decryption
Decryption is the process of converting encrypted data into plain text
What is a cypher
An algorithm that encrypts and decrypts data
What does the reverse cypher do
The reverse cypher reverses the message
What does substitution do
Substitution changes each letter of the alphabet for another
What’s another name for the substitution cypher
Substitution cypher can also be called Caesar cypher
How do you use a keyword in the substitution cypher
Firstly, you need to remove any repeated letters in the word. Then, substitute the first letters of the alphabet with the letters from the keyword. Lastly, add the remaining letter of the alphabet
What is Transposition/ Railfence cypher
With the railfence cypher, the message is split across several lines
What is Transposition/ Route cypher
With the route cypher, the letters are placed into a grid working from top to botttom
