Task&/cipher

using System;
using System.Collections.Generic;
using System.Text;

//Task7:Write a program that encodes and decodes a string using given encryption key (cipher).
//The key consists of a sequence of characters. The encoding/decoding is done by performing XOR (exclusive or)
//operation over the first letter of the string with the first of the key, the second – with the second, etc.
//When the last key character is reached, the next is the first.


namespace Task7Cipher
{
    class Cipher
    {
        static void Crypt(string text)
        {
            string t = text.Trim();
            string[] words = t.Split(' ', ',', '.');
            string key = "ab";
            int L = 0;
            ushort k = 0;
            List<ushort> crypted = new List<ushort>();
            ushort d, c;
            for (int i = 0; i < words.Length; i++)
            {
                L = words[i].Length;
                char[] dm = new char[L];
                for (int j = 0; j < L; j++)
                {
                    dm = words[i].ToCharArray();
                    d = (ushort)dm[j];
                    c = (ushort)(d ^ (ushort)key[k]);
                    crypted.Add(c);
                    if (k == key.Length - 1)
                    {
                        k = (ushort)(k - key.Length);
                    }
                    k++;
                }

            }
            for (int element = 0; element < crypted.Count; element++)
            {
                Console.Write("\\u{1:x4}", crypted[element].ToString(), crypted[element]);
            }
            Console.WriteLine();
        }

        static void Main(string[] args)
        {
            string text = "Nakov this is a text for encoding ";
            Console.WriteLine(text);
            Crypt(text);

        }
    }
}