Computer Network Security

If DES were a group [117], then given keys K1 and K2, there would exist a key K% such that

E(P, K3) = E(E{P, K1),K2) for all plaintext P,

Don't use plagiarized sources. Get Your Custom Essay on
Computer Network Security
Just from $13/Page
Order Essay

and we could also find such a key K3 if any of the encryptions were replaced by decryptions. If equation (6.39) holds, then triple DES is no more secure than single DES. It was established in [45] that DES is not a group and, consequently, triple DES is more secure than single DES. Show that TDES is not a group. Hint: Select TDES keys Κ and K2. You will be finished if you can verify that there does not exist any key K3 for which E(P,K3) = E(E(P,K1),K2) for all possible choices of P.

Consider the “simple” timing attack on RSA .

a. Extend the timing attack to recover the bit d?,. That is, assuming that bit d1 has been recovered, what conditions must Y and Z satisfy so that the attack presented in the text can be used to determine d2?

b. Extend the attack to recover d3, assuming that d1nd d2 have been recovered.

c. In practice, we need to recover about half of the private key bits. Why is this attack not a practical means for recovering such a large number of private key bits?

Place Order
Grab A 14% Discount on This Paper
Pages (550 words)
Approximate price: -
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Try it now!

Grab A 14% Discount on This Paper

Total price:
$0.00

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.