Compression and Encryption
Terms in this set (16)
Data is lost but space is saved
no data is lost during compression, saves some storage but can also take up more if the data next to each other is different
Run Length Encoding
This form of compression takes sequences of repeated values and compresses them.
EEEEHHH becomes E4H3 (saves space)
RLE of sound
Where the number of notes comes first then the letter of the note is next to it 3B1F
Spots regularly occurring data and stores it separably in a dictionary
Compressing larger volumes
repeated words are given a binary value that is referred to in the document to reduce space
Process of converting readable data into unreadable characters to prevent unauthorised access.
Offsetting the alphabet by a certain number to scramble the letters of a communication
Brute force attack
Attack that attempts every possible key or combination.
The only unbreakable cryptographic cipher. Also called a one-time pad
Decoding of the Vernam cipher (exclusive or/ XOR)
Performed bit by bit and uses an exclusive or operation shared key
The one-time pad
Ciphers are based on computational security
Same key is used to encrypt and decrypt data
Uses two separate but related keys to encrypt and decrypt data
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Copyright - Year 7's
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