plumprairie-dog835

Consider a very simple symmetric block encryption algorithm in which 32-bits blocks of
plainext are encrypted using a 64-bit key. Encryption is defined as
C = (P⊕K0 ) ⊞ K1

where C = ciphertext, K = secret key, K0 = leftmost 64 bits of K, K1 = rightmost 64 bits of K,
⊕ = bitwise exclusive OR, and ⊞ is addition mod 264
.

a) Show the decryption equation. That is, show the equation for P as a function of C, K0,
and K1.
b) Suppose and adversary has access to two sets of plaintexts and their corresponding
ciphertexts and wishes to determine K. We have the two equations:

C = (P⊕K0 ) ⊞ K1 ; C’

= (P’⊕K0 ) ⊞ K1

First, derive an equation in one unknown (e.g., K0). Is it possible to proceed further to
solve for K0?

A uniform rod is rotating on a horizontal plane about a vertical axis through one end with a constant angular velocity ω0. Due to internal shear forces, the rod breaks at the mid-point of its length, and the part with the fixed axis has an angular velocity 1.5ω0 in the same sense. Determine the angular velocity of the other half.

What is simplified form of  ? Assume m ≠ 0, n ≠ 0

⭕  

⭕  

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⭕  

Which of the following would be an appropriate null hypothesis?

Explain the difference between true motility, brownian movement and streaming

How to use ITIL guiding principles in a real organizational situation, Please provide 1 example for each principle.

If you bring an unopened bag of potato chip abroad an airplane, you’ll notice that the bag puff up as the plane ascend to a higher altitude. Explain why this happens using the information and terminology you learned in this module.