Programming in CSince communication channels are often noisy,numerous ways have been devised to ensure reliabledata transmission. One successful method uses achecksum. A checksum for a message can becomputed by summing the integer codes of thecharacters in the message and finding the remainerof this sum divided by 64. The integer code for aspace character is added to this reault to obtain thechecksum. Since this value is within the range of thedisplayable characters, it is displayed as a characteras well. Write a program that accepts single-linemessages ending with a period and displays thechecksum character for each message. Yourprogram should continue displaying checksums untilthe user entera a line with only a period.

A C program for the given criteria is as follows, File name: “main.c” #include<stdio.h>…

Answered: Programming in C Since communication…

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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In a special case of a permutation cipher, we take a message, M, and write its letters in an s× t table, in a row-major fashion, and then let the ciphertext be a column-major listing of the entries in the table. For example, to encrypt the message ATTACKATDAWN, using a 3 × 4 table, we would write the message as ATTA CKAT DAWN and then write down the ciphertext as ACDTKATAWATN. The secret key in this cryptosystem is the pair (s, t). How is decryption done in this cryptosystem? Also, how hard would it be to attack this cryptosystem using a ciphertext-only attack?
Suppose you’re consulting for a bank that’s concerned about fraud detection, and they come to youwith the following problem. They have a collection of n bank cards that they’ve confiscated, suspectingthem of being used in fraud. Each bank card is a small plastic object, containing a magnetic stripe withsome encrypted data, and it corresponds to a unique account in the bank. Each account can have manybank cards corresponding to it, and we’ll say that two bank cards are equivalent if they correspond to thesame account.It’s very difficult to read the account number off a bank card directly, but the bank has a high-tech “equivalence tester” that takes two bank cards and, after performing some computations, determines whether theyare equivalent.Their question is the following: among the collection of n cards, is there a set of more than n/2 of themthat are all equivalent to one another? Assume that the only feasible operations you can do with the cardsare to pick two of them and plug them…
Write a client that takes integers M, N, and T as input andruns the following experiment T times: Generate a random pattern of length M and arandom text of length N, counting the number of character compares used by KMP tosearch for the pattern in the text. Instrument KMP to provide the number of compares,and print the average count for the T trials.
kindly do it ASAP Write a code to implement the combination of RSA and AES algorithms. In your implementation, first the RSA will be used to encrypt the secret key for sending from Alice to Bob. On the other hand, the AES will be used for encryption and decryption of long messages between the Alice and Bob. Remember in such type of combination, first the Bob will generate its public and private keys and share its public key with the Alice. The Alice encrypt the short message (secret key for communicating the long messages) using RSA and send it to the Bob. Then Bob decrypts the short message (secret key for communicating the long messages) using its private key and found the short message (secret key for communicating long messages). After that both Alice and Bob use this same secret key for the encryption and decryption of long messages.
Implement a class RLE that uses fixed-length encoding, to compress ASCII bytestreams using relatively few different characters, includingthe code as part of the encoded bitstream. Add code to compress() to make a stringalpha with all the distinct characters in the message and use it to make an Alphabet foruse in compress(), prepend alpha (8-bit encoding plus its length) to the compressedbitstream, then add code to expand() to read the alphabet before expansion.
Defanging an IP Address • Given a valid (IPv4) IP address, a defanged IP address replaces every period “.” with “[.]”. • Example: address = “255.100.50.0”, defanged = “255[.]100[.]50[.]0” • Write a function that accepts a string as input (valid IP address) and returns the defanged IP address. • Test the function in the main method. Sample output at the bottom. • Have the expected defanged address hardcoded and compare it to result from the function
For the following question, use the mapping given in the table. A B C D E F G H I J S Z D U F R B K L M K L M N O P Q R S T J V G N A Q O Y W I U V W Z Y Z E C T H P X Encrypt the following: Pure calculation is, in its way, the poetry of logical way of thinking. Decrypt the message with shift of 3. Open WindowDecrypt the message with shift of 25. Open
Make a client that runs the following test T times and takes M, N, and T as input: Count the number of character comparisons used by KMP to detect the pattern in the text, then construct a random pattern of length M and a random text of length N. The KMP function is used to compute the total number of comparisons and to produce the T-trial average count.
Write a program that uses a brute force technique to find the longest common substring. Use the Timing class to compare the brute force method with the dynamic programming method.
You are given two 32-bit numbers, N and M, and two bit positions, i and j. Write a methodto insert Minto N such that M starts at bit j and ends at bit i. You can assume that the bits j throughi have enough space to fit all of M. That is, if M = 10011, you can assume that there are at least 5bits between j and i. You would not, for example, have j = 3 and i = 2, because M could not fullyfit between bit 3 and bit 2.
: You are given two 32-bit numbers, N and M, and two bit positions, i and j. Write a methodto insert Minto N such that M starts at bit j and ends at bit i. You can assume that the bits j throughi have enough space to fit all of M. That is, if M = 10011, you can assume that there are at least 5bits between j and i. You would not, for example, have j = 3 and i = 2, because M could not fullyfit between bit 3 and bit 2.EXAMPLEInput: NOutput: NSOLUTION10000000000, M10001001100
Encrypt the message " MATH " by translating the letters into numbersand then applying the encryption function given, and then translating the numbers back into letters.(a) f(p)=(17p+5) mod 26 _____ (b) f(p)=(15p+14) mod 26 ___ (c) f(p)=(19p+5) mod 26 ___Use A=0,B=1,C=2,D=3,E=4,F=5,G=6,H=7,I=8, J=9,K=10,L=11,M=12,N=13,O=14,P=15,Q=16,R=17, S=18,T=19,U=20,V=21,W=22,X=23,Y=24,Z=25

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