What is the purpose of a hash function? To provide integrity To preserve a copy of all of the information from the original data segment To create a value that cannot be repudiated by its sender To obfuscate a data segment such that it cannot be deciphered without a key

What is the purpose of a hash function? To provide integrity To preserve a copy of all of the information from the original data segment To create a value that cannot be repudiated by its sender To obfuscate a data segment such that it cannot be deciphered without a key

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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The first step of most signature schemes consists in hashing the message to be signed. Discuss which security property a suitable hash function must have, and briefly show an attack that is possible if the hash function does not have this property.
Question 18
What sets a Key Derivation Function apart from other families of secure hash functions (such as the SHA family of algorithms)? If you wish for your message to be effective, you must be as specific as feasible.
The National Security Agency of the United States developed the SHA1 hashing algorithm. What are the potential downsides of its use?
Can a shared key be used to encrypt an AES key? Justify your answerHash function is compared to keyed hash function. View an example of a hash function with a single key.
What causes a bucket overflow in a hash file structure, and how does it happen? Was there anything that could be done to reduce the number of overflowing buckets?
What sets a Key Derivation Function apart from previous families of secure hash functions (like the SHA family of algorithms) that have been studied? You should provide as much information as you can to ensure that your message is well understood.
a) What is a hash function? b) What is a collision? Which are the characteristies to address collisions? Which solution eliminates collisions?
Explain “Collisions in the hashing” in detail.
What distinguishes a Key Derivation Function from the family of secure hash functions previously studied (such as the SHA family of algorithms)? Include as much detail as necessary to make your message crystal clear.
should a hash function be reversible? - no, because this woild allow the plaintext to be decrypted from the hash, rendering message digests and digital signatures unworkable -yes, because this would allow the hash to contribute to error detection and correction operations -in a limited way, they are reversible, bevause the hash acts as a pointer or key into database and file management systems where the plaintext comes from -none of the above
What sets a Key Derivation Function different from other families of secure hash functions (like the SHA family of algorithms) that have been studied? You should include as much information as you can to ensure that your message is adequately comprehended.