Flashcards in Encryption and Compression Deck (11)
What is compression?
The act of making file size smaller
How many types of compression are there?
Define the two types of compression
No data is lost in compression and original can be recreated exactly
Data deemed non-essential is deleted. An exact replica can not be recovered
Lossy can be compressed to much smaller than lossless compression
What is Run Length Encoding (RLE)
Search for patterns in code that can shortened.
1111122255311111 - 16 bits of data
1, 3 2, 2 5, 1 3, 5 1 - 10 bits of data
ENCRYPTION is the conversion of data into a form that is difficult to read by an unauthorised third party.
DECRYPTION is the process of turning scrambled data into data that can be understood.
CIPHER - The algorithm for encryption
KEY - The secret information used to encrypt/decrypt the data
PLAINTEXT - The original form of the data CIPHERTEXT - The encrypted data
What is the Vernam cipher
Uses Baudot Code and the XOR bitwise operator
Uses a one-time pad key (randomly generated and changes after 1 use)