Modifire help

Can anyone tell me the Key/Modifires below I'm really new to C#

im trying to learn what the keys and Modifires are iv tried google and such but i can never
find anything..

this code was given to me by my buddy i would ask him but he was shipped off about a week ago.

Code:

---


{
    using System;
    using System.IO;

    internal class EncryptionStandard : ITableEncryption
    {
        void ITableEncryption.Decode(ref byte[] data)
        {
            uint num = 0x816;
            for (int i = 0; i < data.Length; i++)
            {
                byte num3 = data[i];
                uint num4 = num;
                byte num5 = 0;
                num4 &= 0xff00;
                num4 = num4 >> 8;
                num5 = (byte) (num4 ^ num3);
                num4 = num3;
                num4 += num;
                num4 &= 0xffff;
                num4 *= 0x6081;
                num4 &= 0xffff;
                num4 += 0x1608;
                num4 &= 0xffff;
                num = num4;
                data[i] = num5;
            }
        }

        void ITableEncryption.Encode(FileStream stream)
        {
            int num = stream.ReadByte();
            uint num2 = 0x816;
            while (num != -1)
            {
                stream.Seek(-1L, SeekOrigin.Current);
                byte num3 = (byte) (num & 0xff);
                byte num4 = 0;
                uint num5 = num2;
                num5 &= 0xff00;
                num5 = num5 >> 8;
                num4 = (byte) (num5 ^ num3);
                num5 = num4;
                num5 += num2;
                num5 &= 0xffff;
                num5 *= 0x6081;
                num5 &= 0xffff;
                num5 += 0x1601;
                num5 &= 0xffff;
                num2 = num5;
                stream.WriteByte(num4);
                num = stream.ReadByte();
            }
        }

        string ITableEncryption.Details
        {
            get
            {
                return "The standard encryption method.";
            }
        }

        string ITableEncryption.Name
        {
            get
            {
                return "Standard";
            }
        }
    }
}

---

come on guys any idea I'm really in a hurry iv been stuck on this for days now

Well, I'm not actually sure what your question means. Could you please explain your problem in more detail? You are more likely to get an answer if you do.

You have not said what your issue is? What is the question that you want answering?