Question

The Diffie-Hellman key exchange is vulnerable to the following type of attack. An opponent Carol intercepts Alice’s public value and sends her own public value to Bob. When Bob transmits his public value, Carol substitutes it with her own and sends it to Alice. After this exchange, Carol simply decrypts any messages sent out by Alice or Bob, and then reads and possibly modifies them before re-encrypting with the appropriate key and transmitting them to the other party.

Choose all the answers that are applicable to the above scenario.

Answer 1

Solution:

I have explained the diffie-hellman exchange along with the explanation of the problem mentioned in the question. It is known as MAN IN THE MIDDLE ATTACK. If you still have any doubt, please let me know.

Diffie- Helman Exchange eon Ex change Step l Alice & Bob 닝 Step 2 - mod n betu e en Allee and İSob. Thi L dnu leut! A z 2- nd Sone 2 2 modl1- how Aice & Bob get a final This houo kej with te odblic kr Hen c 1 stup (1) 's the nort wuakow, since t involws er attack

in the MIDDLE attack MAN Alice Cald. Lt us See how she gets the encryp tion Aljce Bob RI Loi 1 *A, İnte.medratı 亠ne Jr de.cephi NOUw Serd by AMice OS Jends the

Step 1 1 ki: (g')"modn |k2ニAaModn k3-8-- K4eM!)7r.od n m D Jd ence th fr mesayes and k' to deart ob memaa eck