computer security course

QUESTION 22 1. Answer one from the following questions A. Suppose we have a set of blocks encoded with the RSA algorithm and we don't have the private key. Assume n = pq, e is the public key. Suppose also someone tells us they know one of the plaintext blocks has a common factor with n. Does this help us in any way? B. Compare AES to DES. For each of the following elements of DES, indicate the comparable element in AES or explain why it is not needed in AES