Initial exchanges of public keys are vulnerable to man-in-the-middle attacks. Describe as many defences against it...
Initial exchanges of public keys are vulnerable to man-in-the-middle attacks. Describe as many defences against it as you can.
Homework Answers
`Hey,
Note: Brother in case of any queries, just comment in box I would be very happy to assist all your queries
Below figure depicts the attack
One must do something additional to stop MITM attack.
One way to do this is if there is a trusted third party that can
verify (for Bob) that the key he received is Alice's public key.
(This is what TLS does.)
Another is if everyone's public keys are stored in a secure cite
that anyone can access but where you cannot change anyone else's
public key. Then Bob can simply check that kpubM really came from
Alice.
If there is such a site, Alice could, in fact, generate the key
herself and then send it doubly encrypted to Bob via:
F(kpubB,F(kprivA,k))
Then only Bob could decrypt the outer encryption with his public
key and and, then, he decrypts the result with Alice's public key.
This should guarantee that no-one else can decrypt the outer
encryption and only Alice could have encrypted the result of that
decryption.
Kindly revert for any queries
Thanks.
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