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1. Suppose the DES F function mapped every 32-bit input R, regardless of the value of the input K, to a. 32-bit string of ones b. bitwise complement of R c. returning R Hint: Use the following properties of the XOR operation: 1. What function would DES then compute? 2. What would the decryption look like? (A⊕ B) ⊕ C = A⊕ (B ⊕ C) A⊕ A = 0 A⊕ 0 = A A⊕ 1 = bitwise complement of A where A,B,C are n-bit strings of bits 0 is an n-bit string of zeros 1 is an n-bit string of one 2. Let plaintext blocks P1, P2, . . ., Pn be encrypted using CBC to produce ciphertext blocks C1, C2, . . ., Cn. Can encryption be done in parallel? Can decryption? Do the same question, only use OFB.
An alternative proof of the irrationality of square root of 2 counts the number of 2's on the two sides of the equation 2n^2 = m^2 and uses the unique factorization of integers theorem to deduce a contradiction. Write a proof that uses this approa..
Write a Select statement that returns four columns from the Invoices table, named Number, Total, Credits, and Balance
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A phonetic password generator picks two segments randomly for each six-letter password. the form of each segment is consonant, voul, consonant, where V= and C= (V)
When we toss a fair coin, we expect that we get roughly half-and-half Hs and Ts. Of course, this might not happen in general: the question is, how bad can the difference get?
Write a program that reads in two floating-point numbers and tests whether they are the same up to two decimal places. here are two sample runs.
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Determine some of the limitations or dangers you see in the use of AI technologies such as expert systems, virtual reality, and intelligent agents?
How are static methods different from non-static methods? How do you invoke a static method? Give an example of a static method.
Prove or disprove: the set of all regular languages is countable.
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