For the code given below, can you break down what algorithm is being displayed in the given code, please? #include #include #include #include using namespace std; int main() { //Seed random number generator srand(time(NULL)); //Declare variables string message; string encryptedMessage = ""; string decryptedMessage = ""; int myKey; //Get message from user cout << "Enter secret message: "; getline(cin, message); //Get key from user cout << "Enter a key: "; cin >> myKey; //Encrypt message for (int i = 0; i < message.length(); i++) { //Substitution if (isupper(message[i])) { encryptedMessage += (char)((message[i] + myKey - 65) % 26 + 65); } else { encryptedMessage += (char)((message[i] + myKey - 97) % 26 + 97); } //Permutation/Transposition int j = rand() % message.length(); char temp = encryptedMessage[i]; encryptedMessage[i] = encryptedMessage[j]; encryptedMessage[j] = temp; } //Decrypt message for (int i = 0; i < encryptedMessage.length(); i++) { //De-permutation/transposition int j = rand() % message.length(); char temp = encryptedMessage[i]; encryptedMessage[i] = encryptedMessage[j]; encryptedMessage[j] = temp; //De-substitution if (isupper(encryptedMessage[i])) { decryptedMessage += (char)((encryptedMessage[i] - myKey - 65 + 26) % 26 + 65); } else { decryptedMessage += (char)((encryptedMessage[i] - myKey - 97 + 26) % 26 + 97); } } //Print results cout << "Encrypted message: " << encryptedMessage << endl; cout << "Decrypted message: " << decryptedMessage; }
For the code given below, can you break down what algorithm is being displayed in the given code, please? #include #include #include #include using namespace std; int main() { //Seed random number generator srand(time(NULL)); //Declare variables string message; string encryptedMessage = ""; string decryptedMessage = ""; int myKey; //Get message from user cout << "Enter secret message: "; getline(cin, message); //Get key from user cout << "Enter a key: "; cin >> myKey; //Encrypt message for (int i = 0; i < message.length(); i++) { //Substitution if (isupper(message[i])) { encryptedMessage += (char)((message[i] + myKey - 65) % 26 + 65); } else { encryptedMessage += (char)((message[i] + myKey - 97) % 26 + 97); } //Permutation/Transposition int j = rand() % message.length(); char temp = encryptedMessage[i]; encryptedMessage[i] = encryptedMessage[j]; encryptedMessage[j] = temp; } //Decrypt message for (int i = 0; i < encryptedMessage.length(); i++) { //De-permutation/transposition int j = rand() % message.length(); char temp = encryptedMessage[i]; encryptedMessage[i] = encryptedMessage[j]; encryptedMessage[j] = temp; //De-substitution if (isupper(encryptedMessage[i])) { decryptedMessage += (char)((encryptedMessage[i] - myKey - 65 + 26) % 26 + 65); } else { decryptedMessage += (char)((encryptedMessage[i] - myKey - 97 + 26) % 26 + 97); } } //Print results cout << "Encrypted message: " << encryptedMessage << endl; cout << "Decrypted message: " << decryptedMessage; }
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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For the code given below, can you break down what
#include <iostream>
#include <string>
#include <stdlib.h>
#include <time.h>
using namespace std;
int main()
{
//Seed random number generator
srand(time(NULL));
//Declare variables
string message;
string encryptedMessage = "";
string decryptedMessage = "";
int myKey;
//Get message from user
cout << "Enter secret message: ";
getline(cin, message);
//Get key from user
cout << "Enter a key: ";
cin >> myKey;
//Encrypt message
for (int i = 0; i < message.length(); i++)
{
//Substitution
if (isupper(message[i]))
{
encryptedMessage += (char)((message[i] + myKey - 65) % 26 + 65);
}
else
{
encryptedMessage += (char)((message[i] + myKey - 97) % 26 + 97);
}
//Permutation/Transposition
int j = rand() % message.length();
char temp = encryptedMessage[i];
encryptedMessage[i] = encryptedMessage[j];
encryptedMessage[j] = temp;
}
//Decrypt message
for (int i = 0; i < encryptedMessage.length(); i++)
{
//De-permutation/transposition
int j = rand() % message.length();
char temp = encryptedMessage[i];
encryptedMessage[i] = encryptedMessage[j];
encryptedMessage[j] = temp;
//De-substitution
if (isupper(encryptedMessage[i]))
{
decryptedMessage += (char)((encryptedMessage[i] - myKey - 65 + 26) % 26 + 65);
}
else
{
decryptedMessage += (char)((encryptedMessage[i] - myKey - 97 + 26) % 26 + 97);
}
}
//Print results
cout << "Encrypted message: " << encryptedMessage << endl;
cout << "Decrypted message: " << decryptedMessage;
}
On Fri, Apr 22, 2022 at 10:23 AM Darian <darianfoster1010@gmail.com> wrote:
#include <iostream>
#include <string>
#include <stdlib.h>
#include <time.h>
using namespace std;
int main()
{
//Seed random number generator
srand(time(NULL));
//Declare variables
string message;
string encryptedMessage = "";
string decryptedMessage = "";
int key;
//Get message from user
cout << "Enter a message to encrypt: ";
getline(cin, message);
//Get key from user
cout << "Enter a key: ";
cin >> key;
//Encrypt message
for (int i = 0; i < message.length(); i++)
{
//Substitution
if(isupper(message[i]))
{
encryptedMessage += (char)((message[i] + key - 65) % 26 + 65);
}
else
{
encryptedMessage += (char)((message[i] + key - 97) % 26 + 97);
}
//Permutation/Transposition
int j =rand()% message.length();
char temp = encryptedMessage[i];
encryptedMessage[i] = encryptedMessage[j];
encryptedMessage[j] = temp;
}
//Decrypt message
for (int i = 0; i < encryptedMessage.length(); i++)
{
//De-permutation/transposition
int j =rand()% message.length();
char temp = encryptedMessage[i];
encryptedMessage[i] = encryptedMessage[j];
encryptedMessage[j] = temp;
//De-substitution
if(isupper(encryptedMessage[i]))
{
decryptedMessage += (char)((encryptedMessage[i] - key - 65 + 26) % 26 + 65);
}
else
{
decryptedMessage += (char)((encryptedMessage[i] - key - 97 + 26) % 26 + 97);
}
}
//Print results
cout << "Encrypted message: " << encryptedMessage << endl;
cout << "Decrypted message: " << decryptedMessage;
return 0;
}
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