Data

Question 1

Lossy Compression

Answer 1

• Reduces file size by removing some information
• Original file can not be recreated
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Question 2

Lossless Compression

Answer 2

• Does not lose any original information
• Allows the original file to be recreated

Question 3

Run Length Encoding (RLE)​

Answer 3

• Basic method of compression that summarizes consecutive patterns of the same data​
• Works well with image and sound data where data could be repeated many times​

Question 4

Encryption

Answer 4

A way of making sure data cannot be understood. Used to keep data secure

Question 5

Caesar cipher

Answer 5

Letters of the alphabet are shifted by a consistent amount​

Question 6

Symmetric encryption​

Answer 6

• The same private key is used by sender and receiver
• The same key is used to encrypt an decrypt data
• Key exchange is used to share the key
• Key can be intercepted

Question 7

Asymmetric encryption​

Answer 7

• Uses two keys
• Two keys are related
• Public key used to encrypt data
• Private key is used to decrypt data