Maurice Tutor

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About Maurice Tutor

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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, 1 Day 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 4.00

block cipher,

1. For any block cipher, the fact that it is a nonlinear function is crucial to its security.Tosee this, suppose that we have a linear block cipher EL that encrypts 128-bit blocks ofplaintext into 128-bit blocks of ciphertext. Let EL (k, m)  denote the encryption of a128-bit message M under a key (the actual bit length of is irrelevant).Thus,

EL(K,[m1?m2])=EL(k,m1)?EL(k,m2)for all 128-bit Patterns m1,m2

Describe how, with 128 chosen cipher texts, an adversary can decrypt any cipher text without knowledge of the secret key . (A “chosen cipher text” means that an adversary has the ability to choose a cipher text and then obtain its decryption. Here, you have 128 plaintext/cipher text pairs to work with and you have the ability to chose the value of the cipher texts.)

2. Create software that can encrypt and decrypt using S-DES. Test data: use plaintext, cipher text, and key of Problem 1.

Answers

Maurice Tutor
(5)
Status NEW Posted 23 Sep 2017 09:09 AM My Price 4.00

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