Compression and Encryption

Question 1

What is Lossy Compression?

Answer 1

• A type of compression algorithm
• Involves removing unnecessary data (e.g.: background noise) from a digital file in order to reduce its size
• This data is then permanently lost

Question 2

What is Lossless Compression?

Answer 2

• A type of compression algorithm
• Reduces file sizes without sacrificing any significant information in the process
• No data is lost
• Can be RLE or Dictionary

Question 3

What is Ciphertext?

Answer 3

• Text that has gone through a cipher to make it harder to read.
• Opposite of plain text

Question 4

What is a Vernam Cipher?

Answer 4

• The Vernam cipher is an example of a one -time pad cipher.
• This means that each key should only ever be used once. * Additionally, itrequires the key to be random and at least as long as the plaintext that is to be encrypted.

Question 5

What is a One Time Pad?

Answer 5

• An encryption technique that cannot be cracked but requires the use of a single-use pre-shared key that is larger than or equal to the size of the message being sent.