You are creating a database that will store usernames and credit card numbers for an application. You need to recommend a solution to store and reuse the credit card numbers in the database. What should you recommend? More than one answer choice may achieve the goal. Select the BEST answer.
正解:A
Explanation/Reference: Explanation: If we are going to encrypt credit card number for storage, then we should have Data Encryption Key(DEK) for encrypting the credit card number.