4CiphersCeasarAtbashRot13Affine

How can the Atbash cipher be used in modern cryptography?

• As a simple puzzle or educational tool to demonstrate basic encryption concepts.

• As a secure method for encrypting sensitive data.

• To create complex algorithms for data compression.

• As a standard protocol for online banking security.

How does frequency analysis help in breaking a Caesar Cipher?

• By identifying the most common letters in the ciphertext

• By shifting letters by a fixed number

• By substituting letters with random symbols

• By analyzing the length of the ciphertext

What is a common attack method on the Affine cipher?

• Brute force attack

• Frequency analysis

• Substitution attack

• Transposition attack

What is the inverse of 5 modulo 26, which is necessary for decryption in the Affine cipher?

• 15

• 21

• 18

• 24

Compare the Atbash cipher with the Vigenère cipher in terms of complexity.

• Atbash is more complex because it uses a single alphabet.

• Vigenère is more complex because it uses a keyword and a polyalphabetic system.

• Both ciphers are equally complex and have the same level of security.

• Atbash is simpler because it only substitutes letters with their reverse counterparts.

What is the primary function of the ROT13 cipher?

• To encrypt data using a complex algorithm

• To shift each letter by 13 places in the alphabet

• To replace vowels with numbers

• To reverse the order of letters in a message

Describe a scenario where a Caesar Cipher might still be useful today despite its security limitations.

• Teaching basic cryptography concepts

• Encrypting sensitive government communications

• Securing online banking transactions

• Protecting personal data in cloud storage

What room is Mr. Cusack class?

• 501

• 502

• 503

• 504

If you were to encrypt the message "GOODBYE" with a Caesar Cipher using a shift of 4, what would the encrypted message be?

• KSSIEBI

• KUUJEFM

• KSSIEBK

• KSSIEBJ

How do you decrypt a message encrypted with an Affine cipher?

• D(y) = a^{-1}(y - b) \mod m

• D(y) = a(y + b) \mod m

• D(y) = (y + b) \cdot a \mod m

• D(y) = (y - a) \cdot b \mod m