Maurice Tutor

(5)

$15/per page/Negotiable

About Maurice Tutor

Levels Tought:
Elementary,Middle School,High School,College,University,PHD

Expertise:
Algebra,Applied Sciences See all
Algebra,Applied Sciences,Biology,Calculus,Chemistry,Economics,English,Essay writing,Geography,Geology,Health & Medical,Physics,Science Hide all
Teaching Since: May 2017
Last Sign in: 398 Weeks Ago, 3 Days Ago
Questions Answered: 66690
Tutorials Posted: 66688

Education

  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

Experience

  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 23 Sep 2017 My Price 6.00

protocol designer’s reasoning

Consider the following protocol, designed to let A and B decide on a fresh, sharedsession key K‘AB

AB  .We assume that they already share a long-term key KAB.

1. A→B:A, NA.

2. B: A→E(KAB, [NA, K’AB])

3. A→ B:E(K’AB, NA)

a. We first try to understand the protocol designer’s reasoning:

—Why would A and B believe after the protocol ran that they share with the K’AB other party?

—Why would they believe that this shared key is fresh?In both cases, you should explain both the reasons of both A and B, so youranswer should complete the sentences

A believes that she shares K’ABwith B since...

B believes that he shares K’AB with A since...

A believes that K’ ABis fresh since...

B believes that K’ ABis fresh since...

b. Assume now that A starts a run of this protocol with B. However, the connectionis intercepted by the adversary C. Show how C can start a new run of the protocolusing reflection, causing A to believe that she has agreed on a fresh key with B (inspite of the fact that she has only been communicating with C).Thus, in particular,the belief in (a) is false.

c. Propose a modification of the protocol that prevents this attack.

Answers

Maurice Tutor
(5)
Status NEW Posted 23 Sep 2017 09:09 AM My Price 6.00

Hel-----------lo -----------Sir-----------/Ma-----------dam-----------Tha-----------nk -----------You----------- fo-----------r u-----------sin-----------g o-----------ur -----------web-----------sit-----------e a-----------nd -----------and----------- ac-----------qui-----------sit-----------ion----------- of----------- my----------- po-----------ste-----------d s-----------olu-----------tio-----------n.P-----------lea-----------se -----------pin-----------g m-----------e o-----------n c-----------hat----------- I -----------am -----------onl-----------ine----------- or----------- in-----------box----------- me----------- a -----------mes-----------sag-----------e I----------- wi-----------ll

Not Rated(0)