Introduction to Algorithms
Introduction to Algorithms
3rd Edition
ISBN: 9780262033848
Author: Thomas H. Cormen, Ronald L. Rivest, Charles E. Leiserson, Clifford Stein
Publisher: MIT Press
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Chapter 16.3, Problem 6E
Program Plan Intro

To represent optimal prefix code on C using 2n1+nlogn bits

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Suppose you have a signature scheme S (which is correct and existentially unforgeable), and S can be used to sign any t-bit message. And you have a hash function H which outputs t bits and is collision-resistant. Consider a modified signature scheme S’ which can sign messages of unlimited length, where: S’.Sign(sk, m) = S.sign(sk, H(m)) Prove that this scheme is existentially unforgeable as long as S is existentially unforgeable and H is collision-resistant.
Let U = {l, 2, 3, 4, 5, 6, 7, 8, 9, 1 O}, and the ordering of elements of U has the elements in increasing order; that is, aj = i. What bit strings represent the subset of all odd integers in U, the subset of all even integers in U, and the subset of integers not exceeding 5 in U?
(2) For the following list of letter frequencies, create a Huffman tree, and use it to determine the encoding for each of the letters. After you’ve written down the encoding for each letter, determine the average number of bits needed to encode ANY letter using this encoding.  A: .33 B: .10 C: .08 D: .12 E: .37
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