Consider the binary plaintext consisting of the binary bits 11011011 , if these bits are encrypted with a OTP 0110 0111, what is the resulting ciphertext? (2 Points) Imetric key, "Kab". Alice wants to make sure Consider Alice and Bob share a common symmetric key, "Kab". Alice wants to make sure she is talking to Bob. The figure below shows, the corresponding exchange of the first two messages. What should Bob send back to prove to Alice she is indeed talking to him? * 41)(2 Points) and make sure that Bob can check the message Suppose Alice wants to send Bob a message and make sure that Bob can check the message was not altered in transit. Alice first sends the message in plaintext as shown below. After that, she is also going to send some information to Bob to enable him to check if the message was modified in transit or no. To achieve this, what is a possible algorithm that she can use in the block labeled "1"? * ( Dnintc) age. Ine ulagram delow snows me plaintex diock Consider the OSI protocol stack shown on the right. What is the unit of the link layer? (2 Points) Consider the OSI protocol stack. What is the unit of the network layer? * 4) (2 Points) e binary bits 11011011 , if these bits are