) In the time-variant password authentication method, server B sends a random challenge number c to A. To successfully authenticate to B, A returns the value h(c, p) using a suitable hash function for A's password p, where c and p are combined (concatenated) together before being input to the function h(). B, knowing A's password, confirms that the submitted value is correct. Assuming that B might repeat the previously-used challenge, explain how an attacker X can attempt to impersonate A to B. Does the addition of a salt value s to A's response help to protect against the impersonation by X?

) In the time-variant password authentication method, server B sends a random challenge number c to A. To successfully authenticate to B, A returns the value h(c, p) using a suitable hash function for A's password p, where c and p are combined (concatenated) together before being input to the function h(). B, knowing A's password, confirms that the submitted value is correct. Assuming that B might repeat the previously-used challenge, explain how an attacker X can attempt to impersonate A to B. Does the addition of a salt value s to A's response help to protect against the impersonation by X?

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

Hash Table

A hash table also called a hash map, is a data structure that maps key-value pairs. The hash table can be used in complex systems to provide fast access and compact storage. A hash table is a structure that stores data in an abstract data type kind of associative array. It keeps data in an array format, with a distinct index value for every data value. If the index of the required data is known, then the data can be accessed very easily.

Question

Please give me correct solution.

) In the time-variant password
authentication method, server B sends a
random challenge number c to A. To
successfully authenticate to B, A returns the
value h(c, p) using a suitable hash function
for A's password p, where c and p are
combined (concatenated) together before
being input to the function h(). B, knowing
A's password, confirms that the submitted
value is correct. Assuming that B might
repeat the previously-used challenge,
explain how an attacker X can attempt to
impersonate A to B. Does the addition of a
salt value s to A's response help to protect
against the impersonation by X?

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