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- 77. Suppose there are n stations in a slotted LAN. Each station attempts to transmit with a probability P in each time slot. The probability that only one station transmits in a given slot is .................. a. nP(1-P)^n-1 b. nP c. P(1-P)^n-1 d. n^P(1-P)^n-1Over a network using WEP, we were able to capture two frames with the sameInitialization Vector (IV). The following are the encrypted messages:• First frame encrypted message:1 0 0 1 0 0 1 0 1 0 1 1 0 0 0 0 0 1 1 1 0 1 0 1 1 0 0 1 0 1 1 1 1 0 1 1 0 1 1 0 1 0 0 11 1 1 1 1 0 0 1 0 0 0 1 0 0 1 1 1 0 0 0• Second frame encrypted message:1 1 0 0 0 0 0 1 1 1 1 0 0 0 0 1 0 0 1 1 0 1 1 1 1 1 0 0 1 0 1 1 1 1 1 0 0 0 1 1 1 1 0 11 0 1 0 1 1 0 0 1 1 0 0 0 1 1 0 1 1 1 0We also know that one of the messages is a control message with the following plaintext content:0 0 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 0 0 01 0 0 1 1 0 0 1 0 0 0 1 1 1 0 0 01. Find the plaintext of the other message.2. If the captured messages were from two different stations on a network that usesTKIP, is it possible to find the plaintext of the other message? Explain why orwhy not possible.Suppose N people want to communicate with each of N – 1 other people using symmetric key encryption. All communication between any two people, i and j, is visible to all other people in this group of N, and no other person in this group should be able to decode their communication. How many keys are required in the system as a whole? Now suppose that public key encryption is used. How many keys are required in this case?
- For the Zhou-Gollman non-repudiation protocol discussed in the lecture on “Non-Repudiationand Anonymity Protocols”, which one of the following statements is false:a) At time point 4, both A and B can produce evidence to prove that they received Kb) At time point 2, both A and B can produce evidence to prove that they received a signedmessage from the other partyc) At time point 0, S cannot prove anythingd) At time point 3, B cannot produce evidence to prove that A has access to key Ke) At time point 1, A can prove that B is alivef) At time point 4, S can prove that A is aliveg) At time point 3, S can produce evidence that that A has access to key Kh) At time point 0, A is not alivei) At time point 2, A can produce evidence to prove that B is alivej) At time point 4, the protocol terminatesConsider there are 4 stations in the token ring. There is only one packet in the ring. Supposeif the station 1 holds the packet until it completes one revolution and returns to it then whatcould be the Token Holding Time (THT)?a) THT = Propagation delay+ 4*bit delayb) THT = Transmission delay + Propagation delay + 4*bit delayc) THT = Propagation delay + Transmission delay *4d) THT = Transmission delay4.) Suppose that a sender and a receiver are using ARQ to perform reliable data delivery. If we have to send 12 packet and window size of 4 , if every 5 th packet is being transmitted is lost, then how many retransmissions and total number of transmissions are required? (7) a. GoBack-N b. Selective Repeat
- Computer Science Before the introduction of IEEE 802.11i, the security scheme for IEEE 802.11 was Wired Equivalent Privacy (WEP). Assume that the initialization vector (IV) is not used in WEP. Instead, RC4 is applied using K as input and producing s as output. Assume RC4(K, n) is applied for each packet and that all packets have the same length. If an attacker intercepts a single packet with ciphertext C1 and also has a known plaintext/ciphertext pair (P2, C2). Show how the attacker can find the plaintext P1. You can make use of an example by assuming some random data is being encrypted.Msg3. B→A : B, N1, Ks, Message2, h(B, N1, Message2) Whereas: h(m) represents the digest of the message (m). {m}{K} represents the encryption of message (m) using the key (K) PK is public key N1 is a random number. 1. What are the main problems in Msg3?Consider the GBN protocol with a sender window size of 4 and a sequence number rangeof 1,024. Suppose that at time t, the next in-order packet that the receiver is expecting has asequence number of k. Assume that the medium does not reorder messages. Answer thefollowing questions: What are all possible values of the ACK field in all possible messages currently propagating back to the sender at time t? Justify your answer.
- Consider two events, a and b, and a set of these binary events is S = {a, b, a, a, b, a, b, b, b, a, a, a}. If we split the set S at the middle then which of the following is related to information gain/loss? a)0.9951 b) 0.9591 c)0.9159 d)0.9519Give a clear handwritten answer...In a slotted ALOHA network, suppose 0.618 is the probability that a message is successfully transmitted on an attempt. What is the average number of transmission attempts for successful delivery?Consider there are 4 stations in the token ring. There is only one packet in the ring Suppose if the station 1 holds the packet until it completes one revolution and returns to it then what could be the Token Holding Time (THT)? a) THT = Propagation delay+ 4*bit delay b) THT = Transmission delay + Propagation delay + 4*bit delay c) THT = Propagation delay + Transmission delay *4 d) THT = Transmission delay