We say that Trudy is a passive attacker if she can only observe the messages sen
ID: 3838527 • Letter: W
Question
We say that Trudy is a passive attacker if she can only observe the messages sent between Alice and Bob. If Trudy is also able to insert, delete, or modify messages, we say that Trudy is an active attacker. If, in addition to being an active attacker, Trudy is able to establish a legitimate connection with Alice or Bob, then we say that Trudy is an insider. Consider IKE Phase 1 digital signature main mode. a. As a passive attacker, can Trudy determine Alice's identity? b. As a passive attacker, can Trudy determine Bob's identity? c. As an active attacker, can Trudy determine Alice's identity? d. As an active attacker, can Trudy determine Bob's identity? e. As an insider, can Trudy determine Alice's identity? f. As an insider, can Trudy determine Bob's identity?Explanation / Answer
a) As a mentioned above passive attacker is the one who can only obseve the sent messages .If they reveal their identity via messages then only Trudy determines Alice's identity. Otherwise, Trudy not able determines Alice's identity.
b) As a mentioned above passive attacker is the one who can only obseve the sent messages. If they reveal their identity via messages then only Trudy determines Bob 's identity. Otherwise, Trudy not able determines Bob 's identity.
c) As a mentioned above active attacker is the one who can obseve the sent messages as well as insert,delete and modify the messages. If they reveal their identity via messages then only Trudy determines Alice's identity. Otherwise, Trudy not able determines Alice's identity.
d) As a mentioned above active attacker is the one who can obseve the sent messages as well as insert,delete and modify the messages. If they reveal their identity via messages then only Trudy determines Bob's identity. Otherwise, Trudy not able determines Bob's identity.
e) As mentioned above insider is one who is able to establish legitimate connection. So by this Trudy able determines Alice's identity.
f) As mentioned above insider is one who is able to establish legitimate connection. So by this Trudy able determines Bob's identity.
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