Crypto Quiz Practice

What is 7 mod 3?

• 1

• 2

• 3

• 0

What is the role of the key 'b' in the Affine cipher?

• It determines the shift in the substitution.

• It is used to multiply the plaintext.

• It is used to divide the ciphertext.

• It is used to reverse the encryption process.

• True

• False

What is 77 mod 5?

For Modular Arithmetic what value is the most important?

• The Modulo
• The Given Number
• The Remainder
• The Divisor

What is 97 mod 9?

Encode the letter s using the affine rule C=3p+5

Answer explanation

What is 57 mod 7?

• 0 mod 7
• 1 mod 7
• 7 mod 7
• -1 mod 7

What is 99 mod 100?

• 99

• 100

• 1

• 199

In modular arithmetic, what does a ≡ b (mod n) mean?

• a and b have the same remainder when divided by n

• a and b are equal numbers

• a is always greater than b in mod n

• n divides both a and b equally