Assume that (workstation owned by human) Alice and (server) Bobrelay on a Diffie

Question

Assume that (workstation owned by human) Alice and (server) Bobrelay on a Diffie-Hellman exchange to agree on a secret key betweenthem. In order to prevent a man-in-the-middle attack, Bob alwaysuses gW mod p for his part of the exchange. Indeed,the value gW mod p is part of a certificate. EvilMallory indeed has become the man in the middle between Alice andBob. Unfortunately for evil Mallory, she cannot calculate W fromgW mod p. She also cannot substitute another valuefor gW mod p. Therefore, she cannot use herposition as (wo)man in the middle. However, Mallory just learnedthat Alice's workstation does not generate a random value a forAlice's gamod p part of the Diffie Hellman exchange.Rather, Alice's workstation has been seeded with a truly randomnumber, and now for every exchange, a is increased. Question: CanMallory now exploit her position as (wo)man in the middle?

Explanation / Answer

Dear,    Here in the Diffe-Hellman exchange generallysubject to a man-in-the-middle attack because the exchangesthemselves are not authenticated. To circumvent this problem, theDiffie-Hellman exchange is used with a public-key algorithm toensure authentication and integrity in the exchange.    Here Bob uses the gw mod p as apart of exchange. It is very hard for the man-in-the middile toattack the secret key. If he knows how the Alice generates therandom number then there is possibility for man-in-the middleattack. " I hope this will help you "

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