Vigenere Cipher

What type of cipher is the Vigenere cipher classified as?

• A symmetric key cipher
• A transposition cipher
• A polyalphabetic substitution cipher
• A block cipher

How does the Vigenere cipher utilize a matrix in its encryption process?

• It encrypts the plaintext in blocks.
• It organizes the key letters in a linear format.
• It represents possible mappings from one letter to another.
• It uses a matrix to store plaintext letters only.

What is the first step in encrypting a plaintext letter using the Vigenere cipher?

• Process the plaintext letter across the columns.
• Map the plaintext letter to the key letter.
• Determine the key letter.
• Generate the ciphertext.

Which of the following best describes the process of encrypting plaintext in the Vigenere cipher?

• Encrypting letters based on their frequency.
• Encrypting all letters simultaneously.
• Encrypting letters in reverse order.
• Encrypting letters one at a time across the columns.

In the Vigenere cipher, how does the length of the key relate to the plaintext?

• The key should be shorter than the plaintext.
• The key should be longer than the plaintext.
• The key should be the same length as the plaintext.
• The key can be any length.

Which of the following statements about the Vigenere cipher is true?

• It uses a single key letter for all plaintext letters.
• It processes letters one at a time.
• It does not require a key for encryption.
• It encrypts letters in groups of three.

If the plaintext letter 'A' is encrypted using the key letter 'L', what is the resulting ciphertext letter?

• M
• Z
• L
• A

How does the key letter 'E' affect the encryption of the plaintext letter 'T' in the Vigenere cipher?

• It does not affect the encryption.
• It changes 'T' to 'A'.
• It changes 'T' to 'X'.
• It changes 'T' to 'L'.

What happens when the plaintext letter 'T' is mapped using the key letter 'M' in the Vigenere cipher?

• It becomes 'Z'.
• It becomes 'F'.
• It becomes 'A'.
• It remains 'T'.

What is the ciphertext for the plaintext 'A-T-T' using the key 'L-E-M'?

• A-B-C
• T-U-V
• L-X-F
• M-N-O