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Computers and Technology, 16.03.2020 19:13 liliauedt
We consider the following protocol for communication between two parties (i. e., user A and user B) in a company’s computer network so that user A can send a message M to user B: 1. A sends B the block: (, (, ), ) 2. B acknowledges receipt by sending to A the block: (, (, ), ) Note: Blocks exchanges are in the following format: sender’s name, text, receiver’s name. Now, we consider that an adversary C, who is also one of the network’s user (i. e., user C), is able to intercept messages exchanged between A and B. Being a user of the network, the adversary has his own public key, , and private key, , and is able to send his/her own messages to A or to B and to receive theirs. With the help of the above protocol, the adversary could obtain the message M that A has previously sent to B using a 4-step procedure. The first step of the 4-step procedure is that the adversary C intercepts the block sent by A to B. Thus, the adversary holds the block: (, (, ), ). What are the next 3 steps so that the adversary C can get the message M?
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