Our Single Key Encryption code in Java.
Single Key Encryption Class File:
package miscellaneous;
import java.math.BigInteger;
public class SoleKeyEncryption {
public SoleKeyEncryption() {
}
public String[] encodeWord(char[] msg, char[] key) {
// encoding eqn { Tn = 3^n-1(2t1 + 1) - 1 } - please use your own eqn
// 2
String[] encryption = new String[msg.length];
int n;
int t1;
BigInteger Tn;
for (int i = 0; i < msg.length; i++) {
// get unicode of this character as t1
t1 = (int) msg[i];
// get next key digit as n
n = Integer.parseUnsignedInt(Character.toString(key[i % (key.length - 1)]), 16);
// use recurrence series equation to encrypt & save in base 16
Tn = BigInteger.valueOf(3).pow(n - 1).multiply(BigInteger.valueOf(2 * t1 + 1)).subtract(BigInteger.ONE).divide(BigInteger.valueOf(2));
encryption[i] = Tn.toString(16);
}
return encryption;
}
public String decodeWord(String[] code, char[] key) {
// decoding eqn { t1 = 3^1-n(2Tn + 1) - 1 }
// 2
String decryption = "";
int n;
BigInteger t1;
BigInteger Tn;
for (int i = 0; i < code.length; i++) {
Tn = new BigInteger(code[i], 16);
// get next key digit as n
n = Integer.parseUnsignedInt(Character.toString(key[i % (key.length - 1)]), 16);
// use recurrence series equation to decrypt
t1 = BigInteger.valueOf(2 * Tn.intValue() + 1).divide(BigInteger.valueOf(3).pow(n - 1)).subtract(BigInteger.ONE).divide(BigInteger.valueOf(2));
decryption += Character.toString((char) t1.intValue());
}
return decryption;
}
}Main Class:
package miscellaneous;
import java.util.Arrays;
public class Miscellaneous {
public static void main(String[] args) {
char[] message = "merry xmas".toCharArray();
char[] key = "A5FB17C4D8".toCharArray(); // you might want to avoid zeroes
SoleKeyEncryption go_secure = new SoleKeyEncryption();
String[] encrypted = go_secure.encodeWord(message, key);
System.out.println("Message is '" + String.valueOf(message) +
"';\nEncrypted version is " + Arrays.toString(encrypted));
String decrypted = go_secure.decodeWord(encrypted, key);
System.out.println("\n\nDecrypted version is '" + decrypted + "'.");
}
}Try it out!
Elegance (0.0)
