1.3.1. Compression, Encryption and Hashing

In which type of compression is the quality of a file not degraded?

• Lossless
• Lossy
• Imperative
• Declaritive

Name the two categories of compression

• Lossy
• Lossless
• Imperative
• Declaritive

What is the purpose of encryption?

• To keep data secure during transmission
• To hide files from third parties
• To reduce the file size

Identify types of lossless compression

• Run length encoding
• Dictionary encoding
• Transform Coding
• Perceptual Coding

In which form of encryption do the sender and receiver share the same private key?

• Symmetric encryption
• Asymmetric encryption
• Hashing encryption
• PGP encryption

How many keys are used in asymmetric encryption?

• Two (one public and one private)
• Two (two public)
• Two (two private)
• One (one public)
• One (one private)

If person A wants to send a message to person B using asymmetric encryption, which key should they use to encrypt the message?

• B’s public key
• A’s public key
• A’s private key
• B’s private key

What is said to have occured when two keys map to the same hash?

• a collision
• a crash
• an accident
• a smash
• an impact

In which kind of lossless compression are repeated characters replaced by one occurrence and the number of times to repeat the character?

• Run length encoding
• Dictionary encoding
• Transform Coding
• Perceptual Coding

What name is given to the process of turning an input into a fixed size value?

• Hashing
• Compression
• Encryption