coding

How many different values can be represented using 4 bits?

16

What is a pixel?

A single tiny dot, or square, of color in a digital image.

Which of the following statements are true about Caesar's Cipher?

Caesar's Cipher is a form of Symmetric Encryption. Caesar's Cipher is a "easy" encryption to crack

Which of the following are true about Symmetric Key Encryption?

I: The same key is used for both encryption and decryption II: The sender and receiver must exchange a shared key in private before using symmeric key encryption to communicate

Which of the following are true about Public Key Encryption?

It requires all senders and receivers to have their own public key and their own private keyII: A message encrypted with a person's public key can only be decrypted with the same person's private keyIII: A public key can be shared with anyoneIV: Public key encryption is the most common form of encryption for internet communication

Which of the following is true about lossy compression?

Lossy compression can compress data down to significantly less bits than lossless compression can Data compressed with lossy compression cannot be restored back to its original state Incorrect Answer Lossy compression throws away a lot of the original data, but humans can't even tell anything is missing.

Which of the following are examples of encoding information?

Representing fast food meals as numbers on the menu. For example a number 1 represents a hamburger. Assigning a numeric value to every area of a region, for example zip codes in the United States Assigning a number to every character of the alphabet so we can represent sentences as series of simple digits.

What types of data should be compressed with the Run Length Encoding algorithm? What types of data does the algorithm perform well with?

Text with many repeated characters

Which of the following is true about lossless data compression?

The compressed data can be restored back to its original state

What is data abstraction?

The process of simplifying complicated data into manageable chunks

Which of the following is a true statement about data compression?

There are trade-offs involved in choosing a compression technique for storing and transmitting data.

Why do we compress data?

To save memory space on devices To speed up the time it takes to send a file over the internet The computation it takes to decompress data is cheaper than the storage space required to store uncompressed data