Determine whether each of these numbers is a valid USPS. a) 740514896233 b) 883820134453 Suppose that the first 9 digits of the ISBN-10 are 007288008. What is the check digit? a) 561522407 b) 666066311 Decrypt these messages that were encrypted using the Caesar cipher. a) EOXH MHDQV b) WHVW WRGDB . Decrypt these messages encrypted using the shift cipher f (p) = (p + 10) mod 26. a) CEBBOXNOB XYG b) LO WI PBSOXN Encrypt and Decrypt message "AES" using affine ciphers given key (3,4)