Caesar Cipher Check for Understanding

What does the term 'cipher' refer to in cryptography?

• A private message sent between users.

• A method for encrypting or decrypting a set of characters.

• A type of computer virus.

• A secure location to store data.

Which term describes the conversion of plaintext into ciphertext?

• Decryption

• Compression

• Encryption

• Encoding

What does the modulo operator % calculate in arithmetic?

• The sum of two numbers

• The difference between two numbers

• The remainder of the division of one number by another

• The product of two numbers

Which Python function is used to convert a character to its corresponding ASCII value?

• chr()

• str()

• ord()

• ascii()

What is a 'brute force' attack in the context of decrypting ciphers?

• Repairing a corrupted file

• Guessing a password by trying many combinations

• Sending a large number of requests to a server

• Writing an algorithm to optimize code

What is 15 % 4?

• 3

• 4

• 11

• 7

If the current time is 11 PM (23:00), what will be the time after 20 hours using a 24-hour format?

• 19:00

• 7:00

• 21:00

• 3:00

Which statement about the modulo operation is true?

• a % b can be greater than b

• a % b is negative if a is negative.

• a % b is the division of a by b.

• a % b is the remainder when a is divided by b.

In a Caesar cipher program, what does chr((ord(char) - ord('A') + shift) % 26 + ord('A')) accomplish?

• Converts a lowercase letter to uppercase.

• Shifts a character by a certain number of places in the alphabet.

• Calculates the ASCII value of a character.

• Finds the average ASCII value of two characters.

Which of the following is a potential result of executing print(7 % 2)?

• 3.5

• 1

• 2

• 7