Problem 0. Describe at least three ways to use a cryptographic hash function in the context of network security. For each usage, say what properties of crypto hashes are leveraged, and what is achieved.

Problem 0. Describe at least three ways to use a cryptographic hash function in the context of network security. For each usage, say what properties of crypto hashes are leveraged, and what is achieved.

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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Cryptography

Cryptography is a term used in computer science to describe secure information and communication techniques that transform messages in difficult-to-decipher ways using mathematical concepts and a set of rule-based calculations known as algorithms.

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Problem 0. Describe at least three ways to use a cryptographic hash function in the context of
network security. For each usage, say what properties of crypto hashes are leveraged, and what is
achieved.

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Question 1. Understand the following problem scenarios and draw their structural diagrams. a) It is possible to use a hash function but no encryption for message authentication. The technique assumes that the two communicating parties (A and B) share a common secret value S (Salt). A computes the hash value over the concatenation of M and S and appends the resulting hash value to M. Because B possesses, it can recomputed the hash value to verify. Because the secret value itself is not sent, an adversary cannot modify an intercepted message and cannot generate a false message. B) Only the hash code is encrypted, using symmetric encryption. This reduces the processing burden for those applications that do not require confidentiality.
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