Consider a company with 17 employees. How many keys are necessary to allow any pair of employees to securely communicate using symmetric (private-key) cryptography

Mastercard managers are motivated to increase (1) the number of individuals who have and use a mastercard credit card, (2) the number of banks and other clents who issue mastercards to customers and/or employees, and (3) the number of locations that accept mastercard payments. discuss how mastercard could use its data warehouse to it expand each of these customer bases.