Question
Transcribed Text
1. TCP uses Jacobson’s algorithm to update the timeout value. Write a Matlab
function that takes the current estimate of the round-trip time and the latest
acknowledgment time as input arguments and returns the timeout estimate as
output.
2. Alice is communicating with Bob using the RSA algorithm. Bob’s public key
is the pair (� = 199956859, � = 101).
a) Alice has sent the binary sequence in Figure 1 (see next page) to Bob. You
have intercepted this message. Decrypt it and give it as plain text in English.
Clearly explain your answer.
b) What are the weaknesses of the encryption used by Alice?
c) Use Bob’s public key to encrypt the message: “John is a Spy” as a binary
sequence.
0 0 0 1 1 0 1 0 0 0 0 1 0 1 0 0 1 0 1 0
0 1 1 1 1 1 0 1 0 1 0 1 0 1 0 0 1 0 1 1
0 0 1 1 0 1 1 0 1 1 1 1 1 1 1 0 0 0 1 0
1 0 1 0 0 0 0 1 1 0 1 0 1 0 0 0 1 1 1 1
0 1 1 1 1 0 1 1 1 1 0 1 0 0 0 1 0 1 1 1
1 0 0 1 1 1 1 0 0 0 0 0 0 1 0 1 0 1 0 0
1 0 1 1 0 0 1 1 0 1 1 0 1 1 1 1 1 1 1 0
0 0 0 1 1 0 1 1 0 0 1 0 1 1 0 0 0 0 0 1
1 1 0 1 1 1 1 0 1 0 1 1 1 0 0 1 1 1 0 1
1 0 0 1 1 1 1 0 0 1 0 1 1 1 0 0 0 1 0 1
0 1 0 0 1 0 1 1 0 0 1 1 0 1 1 0 1 1 1 1
1 1 1 0 0 0 1 0 1 0 0 1 0 1 0 1 1 0 0 1
1 1 0 0 1 0 0 0 0 0 1 1 0 0 1 0 1 0 1 0
0 0 0 1 1 0 1 0 1 0 0 0 1 1 1 1 0 1 1 1
1 0 1 1 1 1 0 0 0 0 0 0 1 0 1 1 0 0 0 1
0 1 0 1 1 1 0 1 0 0 0 1 1 0 1 1 0 0 1 0
1 1 0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 0 0 0
1 1 1 0 1 0 1 1 1 0 1 0 0 1 0 0 1 0 1 0
1 0 1 0
Figure 1: Alice’s message to Bob
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