Hello,
I am currently solving this problem and wondered if when asked to modify the protocol, we could argue that if Bob sent [ Hello, KA+{nonce}], then Manuel could not decrypt the nonce and reorder as only Alice knows KA-.
Is this a correct answer?
Thank you in advance for your time
Kind regards
Luna
Hi Luna,
Let me make sure I understood your question.
The assumption made in this problem is that Bob does not know Alice's true public key. He receives it from Alice herself. However, Manuel is in the middle and changes the public key. So, Bob could not have encrypted the nonce with the Alice's public key.
Does this make sense? Did you have something different in mind?
Yes it does make sense!
Thank you for your quick answer
Follow the pulses of EPFL on social networks
© 2023 EPFL, all rights reserved