First Commit

README.md

@@ -0,0 +1,19 @@
+# Decrypter 32-bits:
+
+This program decrypts any message with 32-bit encryption, here are two 
+encrypted message examples:
+
+Msg1: 96+!9?-?P,'"$90-=X#?#91?96#>P0+8<=0L55B."=4)
+
+Key 1: 112 Key 2: 120 Key 3: 98 Key 4: 108
+
+Msg2: >U():2*%>U/$_="5309A:&? _%9$)<85>U; -4K 24%)>
+
+Key 1: 127 Key 2: 117 Key 3: 107 Key 4: 97
+
+The process takes time, the time varies according to the speed of your 
+machine, so be patient.
+
+# Authors:
+
+Athos Rodrigues, Gustavo Maciel.

main.cpp

@@ -0,0 +1,73 @@
+#include <iostream>
+#include <stdio.h>
+#include <string>
+#include <cstring>
+
+// Msg1: 96+!9?-?P,'"$90-=X#?#91?96#>P0+8<=0L55B."=4
+// Msg2: >U():2*%>U/$_="5309A:&? _%9$)<85>U; -4K 24%)>
+/*1ª Mensagem: INIMIGOS TENTARAM ASSASSINAR HITLER EM BREVE
+Chaves: Chave 1: 112  Chave 2: 120  Chave 3: 98  Chave 4: 108
+Composição das chaves =  1886937708
+
+2ª Mensagem: A CHEGADA DE HITLER ESTA PREVISTA PARA AMANHA
+Chaves: Chave 1: 127  Chave 2: 117  Chave 3: 107  Chave 4: 97
+Composição das chaves =   2138401633*/
+using namespace std;
+
+int main()
+{
+	string data = "";
+	cout << "Note: Sometimes the application emits a beep, it's because of XOR, sometimes it can type \\a (make a beep) when prints to the screen" << endl;
+	cout << "Type the data, (must be 32 bits): ";
+	cin >> data;
+	char c[45] = {};
+	char toBeMatched[] = {"HITLER"};
+	bool end = false;
+	long longkey1, longkey2, longkey3, longkey4;
+
+	while (end == false) {
+		for (int key1 = 0; key1 < 256; key1++)
+		for (int key2 = 0; key2 < 256; key2++)
+		for (int key3 = 0; key3 < 256; key3++)
+		for (int key4 = 0; key4 < 256; key4++) {
+			for (int i = 0, j = 1, k = 2, l = 3; i < data.size() && j < data.size() && k < data.size() && l < data.size(); i = i + 4, j = j + 4, k = k + 4, l = l + 4) {
+				c[i] = data[i];
+				c[i] ^= key1;
+
+				c[j] = data[j];
+				c[j] ^= key2;
+
+				c[k] = data[k];
+				c[k] ^= key3;
+
+				c[l] = data[l];
+				c[l] ^= key4;
+			}
+			string msg(c);
+			if (strstr(c, toBeMatched)) {
+				cout << key1 << "-" << key2 << "-" << key3 << "-" << key4 << " = " << msg << endl;
+				longkey1 = key1;
+				longkey2 = key2;
+				longkey3 = key3;
+				longkey4 = key4;
+
+				longkey1 <<= 24;
+				longkey2 <<= 16;
+				longkey3 <<= 8;
+				longkey4 = longkey4;
+
+				cout << endl << "As chaves sao: " << "Chave 1: " << key1 << "  Chave 2: " << key2 << "  Chave 3: " << key3 << "  Chave 4: " << key4;
+				cout << endl << "A chave e: " << longkey1 + longkey2 + longkey3 + longkey4 << endl;
+				system("pause");
+
+			}
+			else {
+				cout << key1 << "-" << key2 << "-" << key3 << "-" << key4 << " = " << msg << endl;
+			}
+		}
+	}
+	system("pause");
+	cout << endl;
+	cin.get();
+	return 0;
+}