What's is the use of encapsulation in transport layer of OSI​

What does operator overloading allow you to do?

Which of the following is a way the operating system prevents unknown or unauthorized users from accessing the system?

3. bob is arguing that if you use output feedback (ofb) mode twice in a row to encrypt a long message, m, using the same key each time, it will be more secure. explain why bob is wrong, no matter what encryption algorithm he is using for block encryption (15 points).