Create RC.java

ENCRYPTION/RC.java

@@ -0,0 +1,91 @@
+import java.io.*;
+
+class RC {
+
+    static String display(int disp[]) {
+        char convert[] = new char[disp.length];
+        for (int l = 0; l < disp.length; l++) {
+            convert[l] = (char) disp[l];
+        }
+        String str = String.copyValueOf(convert);
+        return str;
+    }
+
+    public static String encryption(String ptext) {
+        int temp = 0;
+        String key;
+        int s[] = new int[256];
+        int k[] = new int[256];
+
+        key = "AIMS";
+
+        char ptextc[] = ptext.toCharArray();
+        char keyc[] = key.toCharArray();
+        int cipher[] = new int[ptext.length()];
+        int decrypt[] = new int[ptext.length()];
+        int ptexti[] = new int[ptext.length()];
+        int keyi[] = new int[key.length()];
+
+        for (int i = 0; i < ptext.length(); i++) {
+            ptexti[i] = (int) ptextc[i];
+        }
+
+        for (int i = 0; i < key.length(); i++) {
+            keyi[i] = (int) keyc[i];
+        }
+
+        for (int i = 0; i < 255; i++) {
+            s[i] = i;
+            k[i] = keyi[i % key.length()];
+        }
+
+        int j = 0;
+        for (int i = 0; i < 255; i++) {
+            j = (j + s[i] + k[i]) % 256;
+            temp = s[i];
+            s[i] = s[j];
+            s[j] = temp;
+        }
+
+        int i = 0;
+        j = 0;
+        int z = 0;
+        for (int l = 0; l < ptext.length(); l++) 
+        {
+            i = (l + 1) % 256;
+            j = (j + s[i]) % 256;
+            temp = s[i];
+            s[i] = s[j];
+            s[j] = temp;
+            z = s[(s[i] + s[j]) % 256];
+            cipher[l] = z ^ ptexti[l];
+            decrypt[l] = z ^ cipher[l];
+        }
+
+        System.out.print("\n\nENCRYPTED:\t\t");
+        String encrypted = display(cipher);
+
+        return encrypted;
+    }
+    public static void main(String args[]) throws IOException {
+
+        BufferedReader d = new BufferedReader(new InputStreamReader(System.in));
+        System.out.println("Enter text1: ");
+        String ptext1 = d.readLine();
+        String output1 = encryption(ptext1);
+        System.out.println(output1);
+
+        System.out.println("Enter text2: ");
+        String ptext2 = d.readLine();
+        String output2 = encryption(ptext2);
+        System.out.println(output2);
+
+        if(output1.compareTo(output2) == 0) {
+            System.out.println("Sign in successful");
+        }
+        else {
+            System.out.println("Incorrect text");
+        }
+
+    }
+}