Maurice Tutor

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Expertise:
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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
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Education

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

Experience

  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 10 Oct 2017 My Price 7.00

public key system

In a public key system using RSA you intercept the ciphertext C=4 sent to a user whose public key is e = 7, n = 33. What is the plaintext M?

M = ________________

Fermat's Theorem:   a p-1 = 1 mod p

Euler's Theorem:   a = 1 mod n

Modular arithmetic: (a*b) mod n = (a mod n * b mod n) mod n

                                (a+b) mod n = (a mod n + b mod n) mod n

RSA Algorithm (public key cryptography)

select prime numbers p,q

calculate n = p*q

calculate ?(n) = (p-1)(q-1)

select integer e relatively prime to ?(n)

find integer d which has the property e*d mod ?(n) = 1

create public key = KU = [e,n]

create private key = KR = [d,n]

ciphertext C = Pe mod n   

plaintext   P = Cd mod n  

500

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Answers

Maurice Tutor
(5)
Status NEW Posted 10 Oct 2017 10:10 PM My Price 7.00

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