Understanding Encryption: A Computer Science Quiz

Why is encryption crucial when communicating over the internet?

• To speed up data transfer

• To prevent data interception

• To increase data size

• To reduce data clarity

What does a determined attacker capable of intercepting data signify about the internet?

• It is an open system

• It is highly secure

• It is outdated

• It is a closed system

How does encryption protect your data?

• By deleting data after sending

• By making data unreadable to unauthorized users

• By changing the data path

• By alerting the sender about interceptions

What is the primary function of a Caesar cipher in encryption?

• To convert data into binary form

• To shift data location

• To duplicate the data

• To shift each letter in the data by a set number of positions in the alphabet

If 'H' is encrypted with a Caesar cipher using a key of two, what is the resulting letter?

• L

• I

• K

• J

What is necessary to decrypt a message encrypted with a Caesar cipher?

• The key used for encryption

• Permission from the receiver

• The encryption software

• The original data

How does the Caesar cipher specifically alter data?

• By reversing the data sequence

• By shifting letters based on a key

• By replacing letters with numbers

• By encrypting only vowels

What illustrates the effectiveness of encryption in protecting sensitive information?

• Scrambling data to make it unreadable without a key

• Permanent deletion of original data

• Data size reduction

• Conversion of data into symbols

What is the result of decrypting data that was encrypted using a Caesar cipher?

• The data is permanently altered

• The original data is restored

• The data becomes compressed

• The data is split into parts

Why is it important to keep the encryption key secure?

• To increase the encryption speed

• To maintain internet connectivity

• To prevent unauthorized data decryption

• To comply with data laws