Q1. Suppose that f: {0, 1}m→ {0, 1}™ is a prcimage resistant bijection. Definc h: {0, 1}2m → {0, 1}" as follows. Given x E {0, 1} 2m, write x = x' || x'" where x', x" E {0, 1}". Then define h(x) = f(x'O x") Show that h is not second preimage resistant.
Q1. Suppose that f: {0, 1}m→ {0, 1}™ is a prcimage resistant bijection. Definc h: {0, 1}2m → {0, 1}" as follows. Given x E {0, 1} 2m, write x = x' || x'" where x', x" E {0, 1}". Then define h(x) = f(x'O x") Show that h is not second preimage resistant.
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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![Q1. Suppose that l: {0, 1}" → {0, 1}" is a prcimage resistant bijcction. Define
h: {0, 1}2m →
{0, 1}" as follows. Given x € {0, 1} 2m, write
x = x' || x'"
where x', x" E {0, 1}". Then define
h(x) = f(x'O x")
Show that h is not second preimage resistant.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F34aeec3a-e5d3-41bb-9107-3bfab03597cc%2F94ca504c-a6cb-4ddf-904f-e35bbd6a514d%2Fy59gwf_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Q1. Suppose that l: {0, 1}" → {0, 1}" is a prcimage resistant bijcction. Define
h: {0, 1}2m →
{0, 1}" as follows. Given x € {0, 1} 2m, write
x = x' || x'"
where x', x" E {0, 1}". Then define
h(x) = f(x'O x")
Show that h is not second preimage resistant.
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