Problem 2. One key difference between a cryptographic hash and an encryption algorithm is that the former does not need a "key" to be used. Given a good encryption algorithm (say, AES), it is infeasible to recover the plaintext of an encryption message. So why not use something like AES with a fixed key (say, 0) as a hash algorithm?

Problem 2. One key difference between a cryptographic hash and an encryption algorithm is that the former does not need a "key" to be used. Given a good encryption algorithm (say, AES), it is infeasible to recover the plaintext of an encryption message. So why not use something like AES with a fixed key (say, 0) as a hash algorithm?

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

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 2. One key difference between a cryptographic hash and an encryption algorithm is that
the former does not need a "key" to be used. Given a good encryption algorithm (say, AES), it is
infeasible to recover the plaintext of an encryption message. So why not use something like AES
with a fixed key (say, 0) as a hash algorithm?
Problem 3. The purpose of this problem is to get you to work though an actual Diffie-Hellman
ephemeral key exchange algorithm. (The algorithm itself can be found in the slides for the Video

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