Problem:

1. Let the public key associated with an RSA key be (3,15) where e = 3 is the encryption exponent, and n = 15 is the modulus. The corresponding decryption exponent d is then

a. 1
b. 3
c. 8
d. 15

2. The following bit string is an input to an S-Box of the DES: 101111. Which row and column of the S-Box will be used to determine the output?

a. Row 2, Column 7
b. Row 3, Column 7
c. Row 7, Column 2
d. Row 7, Column 3

Additional Information:

These multiple choice questions is from Computer Science. The 1st question is about determining the decryption exponent for RSA key encryption exponent. The 2nd question is about determining the output for S-Box of DES: 101111.