#include #include #include using namespace std; /* Program Name: Message Encryption Author: Kyle May Description: Scans for a specific character value and replaces it. The goal is to keep working on this until it can create a random secret code from a string. Inputs: initialString, iteration variable, sizeOfString, replacement value Processing: Find and replace all instances of whitespace with the replacement value Outputs: Secret Code and Console Logs Errors: I haven't figured out the memory location termination issue after decryption yet. */ //Run Program int main() { //Declarations string message = "Dogs are fluffy."; int i = 0; char currentChar = message.at(i); int messageSize = message.size(); char decryptChoice = 'y'; string encryptMessage(string message, int numEncryption); int numEncryption = 0; //Main Processes cout << "----------- MESSAGE ENCRYPTION PROGRAM----------" << endl; cout << "\n------------HOW IT WORKS------------------------\n\nThis program only supports English\n\nTo use, simply enter a message to encrypt. If you already have an encrypted message, enter it to decrypt it. "; cout << "\n\n------------BEGIN-------------------------------\n\nEnter the message you wish to encrypt" << endl; //UNCOMMENT FOR INPUT getline(cin, message); cout <<"\nThe size of your message is: " << message.size() << "\n"; //Encrypt Message numEncryption++; message = encryptMessage(message, numEncryption); //Option to decrypt cout << "\nWould you like to decrypt this message back to normal? (y/n)"; //UNCOMMENT FOR INPUT cin >> decryptChoice; //If the user wants to decrypt the message, decrypt using the decryptMessage function if (decryptChoice == 'y') { numEncryption++; encryptMessage(message, numEncryption); } return 0; } //Encrypt or Decrypt the Message string encryptMessage(string message, int numEncryption){ int i = 0; string prefix = "0xK"; char currentChar = message.at(i); int messageSize = message.size(); bool encrypting; if (message.at(0) == '0' && message.at(1) == 'x' && message.at(2) == 'K') { message = message.substr(3); encrypting = false; } else { encrypting = true; } do { if (isspace(message.at(i)) || message.at(i) == '!') { switch (message.at(i)) { case ' ': message.at(i) = '!'; break; case '!': message.at(i) = ' '; break; default: message.at(i) = '#'; break; } cout << "Scanning..." << i << "\n\nWhitespace was found. Converting to '" << message.at(i) << "'\n" << "New message is: '" << message << "'\n" << endl; i++; } else if (isdigit(message.at(i)) || message.at(i) == '%') { switch (message.at(i)) { case '1': message.at(i) = '9'; break; case '2': message.at(i) = '8'; break; case '3': message.at(i) = '7'; break; case '4': message.at(i) = '6'; break; case '5': message.at(i) = '5'; break; case '6': message.at(i) = '4'; break; case '7': message.at(i) = '3'; break; case '8': message.at(i) = '2'; break; case '9': message.at(i) = '1'; break; case '0': message.at(i) = '%'; break; default: message.at(i) = '0'; break; } cout << "Scanning..." << i << "\n\nA number was found. Scrambling digit to'" << message.at(i) << "'\n" << "New message is: '" << message << "'\n" << endl; i++; } else if (isalpha(message.at(i))) { switch (message.at(i)) { case 'a': message.at(i) = 'Z'; break; case 'A': message.at(i) = 'z'; break; case 'b': message.at(i) = 'Y' ; break; case 'B': message.at(i) = 'y'; break; case 'c': message.at(i) = 'X' ; break; case 'C': message.at(i) = 'x'; break; case 'd': message.at(i) = 'W'; break; case 'D': message.at(i) = 'w'; break; case 'e': message.at(i) = 'V'; break; case 'E': message.at(i) = 'v'; break; case 'f': message.at(i) = 'U'; break; case 'F': message.at(i) = 'u'; break; case 'g': message.at(i) = 'T'; break; case 'G': message.at(i) = 't'; break; case 'h': message.at(i) = 'S'; break; case 'H': message.at(i) = 's'; break; case 'i': message.at(i) = 'R' ; break; case 'I': message.at(i) = 'r'; break; case 'j': message.at(i) = 'Q' ; break; case 'J': message.at(i) = 'q'; break; case 'k': message.at(i) = 'P' ; break; case 'K': message.at(i) = 'p'; break; case 'l': message.at(i) = 'O' ; break; case 'L': message.at(i) = 'o'; break; case 'm': message.at(i) = 'N' ; break; case 'M': message.at(i) = 'n'; break; case 'n': message.at(i) = 'M' ; break; case 'N': message.at(i) = 'm'; break; case 'o': message.at(i) = 'L' ; break; case 'O': message.at(i) = 'l'; break; case 'p': message.at(i) = 'K' ; break; case 'P': message.at(i) = 'k'; break; case 'q': message.at(i) = 'J' ; break; case 'Q': message.at(i) = 'j'; break; case 'r': message.at(i) = 'I' ; break; case 'R': message.at(i) = 'i'; break; case 's': message.at(i) = 'H' ; break; case 'S': message.at(i) = 'h'; break; case 't': message.at(i) = 'G' ; break; case 'T': message.at(i) = 'g'; break; case 'u': message.at(i) = 'F' ; break; case 'U': message.at(i) = 'f'; break; case 'v': message.at(i) = 'E' ; break; case 'V': message.at(i) = 'e'; break; case 'w': message.at(i) = 'D' ; break; case 'W': message.at(i) = 'd'; break; case 'x': message.at(i) = 'C' ; break; case 'X': message.at(i) = 'c'; break; case 'y': message.at(i) = 'B' ; break; case 'Y': message.at(i) = 'b'; break; case 'z': message.at(i) = 'A' ; break; case 'Z': message.at(i) = 'a'; break; default: message.at(i) = '#'; break; } cout << "Scanning..." << i << "\n\nAlpha numeric character was found. Converting to '" << message.at(i) << "'\n" << "New message is: '" << message << "'\n" << endl; i++; } else { i++; cout << "Scanning..." << i << "\n" << endl; } } while (i < messageSize); if (encrypting = true) { message = (prefix + message); cout << "\nEncryption Complete!\n\nYour encrypted message is: " << message << "\n" << endl; } else { cout << "\nDecryption Complete!\n\nYour Decrypted message is: " << message << "\n" << endl; } return message; }

Message Encryption Program