Assume Alice and Bob are communicating via a computer network. Suppose Trudy arranges herself in the network such she can catch all packets transmitted by Alice and send whatever she wants to Bob. List some of Trudy's harmful actions from here.
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Assume Alice and Bob are communicating via a
Suppose Trudy arranges herself in the network such she can catch all packets transmitted by Alice and send whatever she wants to Bob. List some of Trudy's harmful actions from here.
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- Let's pretend that Alice and Bob are exchanging data packets across a network.Let's say Trudy infiltrates the network and is able to read all of Alice's data, then forwards it on to Bob along with whatever other information she chooses. Provide some examples of what kind of harm Trudy can do from this vantage point.Suppose Alice and Bob are sending packets to each other over a computer network. Suppose Trudy positions herself in the network so that she can capture all the packets sent by Alice and send whatever she wants to Bob; she can also capture all the packets sent by Bob and send whatever she wants to Alice. List some of the malicious things Trudy can do from this position.Through an unsafe communication connection, Alice needs to send Bob a confidential note. Describe a cost-effective method of protecting the letter's secrecy from eavesdroppers. Assume that Alice and Bob have no prior knowledge of each other's secrets.
- Alice needs to transmit a 48-bit message using a 47-bit key. Suggest a scheme that is perfectly secure.This raises the question: Why does the maximum packet lifetime have to be long enough to guarantee that not only the packet, but also its acknowledgements, are gone?Justify the following statements with appropriate reasons:i. Packets are lost only when network failures occur, but when the network heals packets areretained? ii.. Describe the following Weighted Random Early Detection (WRED) parameters such as minimum threshold, maximum threshold, and Mark Probability Denominator (MPD).
- Given Alice wants to communicate with Bob over an insecure network, you are required to• Design a protocol based on a shared secret key to allow them to authenticate each other; • Explain the limitation of using the shared secret key in this contextThis begs the issue of why the maximum packet lifetime must be long enough to ensure that not only the packet, but also any acknowledgements associated with it, are no longer present.Alice needs to send a private letter to Bob through an insecure communication channel. Describe an economic way against eavesdropper to protect the confidentiality of the letter. Assume that Alice and Bob donot have any pre-shared secret.
- Computer Science Suppose that an adversary, Eve, creates a public and private key and tricks Bob into registering pkE as a trusted certificate authority (that is, Bob thinks Eve is a trusted certificate authority). Assume that Alice is a web server and Bob a client and they connect to one another using SSL/TLS. Show a Man in the Middle attack allowing Eve to listen in on all communication between Alice and Bob even if Alice and Bob use SSL/TLS and even if Alice (the server) has a certificate from a real certificate authority (Alice does not trust Eve as a CA).Consider the case of Alice sending a message, m, to Bob. Both Alice and Bob use public key cryptography and each has a public and private key as described in the text. The figure attached below shows the operations that Alice must perform to provide confidentiality, authentication, and integrity when sending a message to Bob over the network. We can use either symmetric key or public key cryptography to encrypt a message. For our purposes, either technique will encrypt the message, and applying both doesn't make it "more secure". Also, we can assume that the session key would remain a secret so the fact that it is discarded does not make it "more secure". Why do we use a session key, Ks, instead of relying only on public key Cryptography? In other words, why do we use both public key and symmetric key cryptography?