Our Single Key Encryption code in C#.
Single Key Encryption Class File:
using System;
using System.Numerics;
using System.Globalization;
namespace Miscellaneous_CS
{
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 = Convert.ToInt32(key[i % (key.Length - 1)].ToString(), 16);
// use recurrence series equation to encrypt & save in base 16
Tn = BigInteger.Divide(BigInteger.Subtract(BigInteger.Multiply(BigInteger.Pow(3, n - 1), 2 * t1 + 1), 1), 2);
encryption[i] = Tn.ToString("X");
}
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 = BigInteger.Parse(code[i], NumberStyles.HexNumber);
// get next key digit as n
n = Convert.ToInt32(key[i % (key.Length - 1)].ToString(), 16);
// use recurrence series equation to decrypt
t1 = BigInteger.Divide(BigInteger.Subtract(BigInteger.Divide(2 * Tn + 1, BigInteger.Pow(3, n - 1)), 1), 2);
decryption += (char)t1;
}
return decryption;
}
}
}Main Class:
using System;
namespace Miscellaneous_CS
{
class Program
{
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);
Console.WriteLine("Message is '" + String.Join("", message) +
"';\nEncrypted version is " + String.Join(", ", encrypted));
string decrypted = go_secure.decodeWord(encrypted, key);
Console.WriteLine("\n\nDecrypted version is '" + decrypted + "'.");
}
}
}Try it out!
Elegance (0.0)
