Problem 3: 50%] Implement using any programming language, preferably in Python, the NIST digital signature algorithm (DSA) described on Slides 23-28 (Module 4, Part 2). Assume that A. L=512 and N=160 B. SHA-256 is used as the hash function M M H PU

Problem 3: 50%] Implement using any programming language, preferably in Python, the NIST digital signature algorithm (DSA) described on Slides 23-28 (Module 4, Part 2). Assume that A. L=512 and N=160 B. SHA-256 is used as the hash function M M H PU

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.

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Problem 3: 50% ] Implement using any programming language, preferably in Python, the NIST digital
signature algorithm (DSA) described on Slides 23-28 (Module 4, Part 2). Assume that
A. L=512 and N= 160
B. SHA-256 is used as the hash function.
M
H
Sig
PUO
PR,
M
H
PU
PU
Ver
Compare

Branch of computer science concerned with using technology to solve problems that typically require human intelligence.

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Problem 5 ( ,. Suppose that your hash function resolves collisions using open addressing with double hashing, which we discussed in the class. The double hashing method uses two hash functions h and h'. Assume that the table size N = 13, h(k) = k mod 13, h '(k) = 1 + (k mod 11), and the current content of the hash table is: 0 1 2 3 4 5 6 7 8 9 10 11 12 28 98 59 22 43 51 If you insert k = 15 to this hash table, where will it be placed in the hash table? You must describe, step by step, how the location of the key is determined.
2. Suppose you have the following hash table, implemented using linear probing. The hash function we are using is the identity function, h(x) = x. 0 9 1 A B с D E 18 2 3 4 S 12 3 14 7 8 a) In which order could the elements have been added to the hash table? There are several correct answers, and you should give all of them. Assume that the hash table has never been resized, and no elements have been deleted yet. 12, 14, 3, 9, 4, 18, 21 12, 9, 18, 3, 14, 21,4 12, 3, 14, 18, 4, 9, 21 9, 12, 14, 3, 4, 21, 18 9, 14, 4, 18, 12, 3, 21 6 4 21
1. A hash table with 10 buckets uses the hash function f(x) = x % 10, and linear probing to resolve collisions. If the keys [232, 227, 11, 106, 107] are inserted in that order into the hash table, what is the greatest number of steps a number can be from its natural position in the table?
A hash table is a very important data structure in computer science. It is used for fast information retrieval. Itstores data as a < key, value > pair, where the value is indexed by the key. Note that keys must ne unique.Consider the example of storing persons name using the social security number (ssn) as the key. For eachssn x, a hash function h is used, where h(x) is the location to store the name of x. Once we have created atable, to look up the name for ssn x, we can recomputes h(x) and then look up what is stored in that location.In Python, dictionaries are based on hash tables. Typically, the hash function h is deterministic; we do notwant to get different results every time we compute h(x). But h is often chosen to be pseudo-random. Forthis problem, we will assume that h is truly random. Suppose there are k people, with each person’s namestored in a random location (independently), represented by an integer between 1 and n, k < n. It mayhappen that one location has…
Design a hash function for representing the state of a tic-tac-toe board.(It would—for strategy reasons—be useful to have mirror images of a board beconsidered equal.)
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In Python, implement a hashing table data structure of size 20, which can cope with collisions. Thus, you must implement the closed collision system in its three modes: Linear scanQuadratic scanDouble hashing scan. For h_alt use h_alt(k) = (k mod (m - 1)) + 1, where m is the size of the table. The data to be managed are students from a certain university who have a 5-digit registration number and it is unique. In addition, the student has a name, age and address. Create a .txt file with 10 students (one for each line) and have them loaded into your program. Build a menu of options where you can: - Find a student and print his data if found and position in the table. Otherwise print a "Not Found" message. - Delete a student and return the position from which it was eliminated. If the student does not exist, print a message. - Enter a new student. For this option, that only allows entering the 5-digit license plate and that random data is automatically generated for the name, age and…
python In simple uniform hashing, each key is assumed to have equal probability to map to any ofthe hashes in a given table of size m. Given an open-address table of size 100 and 2random keys, what is the probability that they hash to the same value? What is theprobability that they hash to different values?
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Implement c# program to Retrieving a value using its associated key can be accomplished using an indexer, which works just like an indexer for an array. A key is passed in as the index value, and the value associated with the key is returned, unless the key doesn’t exist, in which a null is returned. you can use an indexer along with the Keys method to retrieve all the data stored in a hash table
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This question relates to hash functions for block ciphers Block size = 4 bits Hash size = 4 bits Encryption function: Divide the key into two halves: LK and RK; Divide the plaintext into two halves: LT and RT; Then ciphertext= LC||RC where LC=LK XOR RT; and RC = RK XOR LT; where LC, RC, LT, and RT are each 2 bits; Plaintext and ciphertext are each 4 bits. g(H) = a 4-bit string that is equal to the complement of bits in H; For example, if H=A (Hexa) = 1010 (binary); then g(H)= 0101 H0 = Initial hash = C (in Hexa) Given message M: D9 (in Hexa); a. Determine the hash (in hexadecimal) of the message M using Martyas-Meyer-Oseas hash function b. Determine the hash (in hexadecimal) of the message M using Davis-Meyer hash function c. Determine the hash (in hexadecimal) of the message M using Migayuchi-Preneel hash function