Consider our authentication protocol in this figure in which Alice authenticates

Question

Consider our authentication protocol in this figure in which Alice authenticates herself to Bob, which we saw works well (i.e. we found no flaws in it). Now suppose that while Alice authenticating herself to Bob, Bob must authenticate himself to Alice. Give a scenario by which Trudy, pretending to be Alice, an now authenticate herself to Bob as Alice. (Hint: Consider that the sequence of operations of the protocol, one with Trudy initiating and one with Bob initiating, can be arbitrarily interleaved. Pay particular attention to the fact that both Bob and Alice will use a nonce, and that if care is not taken, the same nonce can be used maliciously.)

Explanation / Answer

Consider our authentication protocol in this figure in which Alice authenticates

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.