Alice signs the hash of a message. Suppose her hash function satisfies h(x) = 2ª (mod 101) and 1< h(x) < 100 for all x. Suppose m is a valid signed message from Alice. Give another message m1 for which the same signature is also valid.

Alice signs the hash of a message. Suppose her hash function satisfies h(x) = 2ª (mod 101) and 1< h(x) < 100 for all x. Suppose m is a valid signed message from Alice. Give another message m1 for which the same signature is also valid.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Fundamentals of blockchaining

In a business network, the tracking assets and the process of recording transactions are facilitated by the shared immutable ledger called a blockchain. Assets are of two types they are tangible and intangible. The tangible assets are land, house, cash, etc. The intangible assets are copyrights, branding, properties patterns, intellectual property, etc. On a blockchain network, anything that has a value can be tracked and it can be traded.

Question

Alice signs the hash of a message. Suppose her hash function satisfies h(x) = 2° (mod 101)
and 1 < h(x) < 100 for all x. Suppose m is a valid signed message from Alice. Give another
message m1 for which the same signature is also valid.

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