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# Encryption and Decryption in C#

Posted By:Abhisek Panda       Posted Date: October 26, 2009    Points: 10    Category: Encryption & Decryption    URL: http://www.dotnetspark.com

# Encryption and Decription

The following program demonstrates how to encrypt or decrypt data using C#. It follows 64 bit encryption technology. You can use this code in your program to Encrypt your passwords or some important data.

`using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace EncryptDecrypt{     public class EncryptDecrypt    {        const char fillchar = '=';        static string cvt = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";        //Method to encrypt data        static public string Encode(string data)        {            int i;            int c;            int len = data.Length;            string ret = "";            for (i = 0; i < len; ++i)            {               c = (data >> 2) & 0x3f;                ret += cvt[c];                c = (data << 4) & 0x3f;                if (++i < len)                    c |= (data >> 4) & 0x0f;                ret += cvt[c];                if (i < len)                {                    c = (data << 2) & 0x3f;                    if (++i < len)                        c |= (data >> 6) & 0x03;                    ret += cvt[c];                }                else               {                    ++i;                    ret += fillchar;                }                if (i < len)                {                   c = data & 0x3f;                    ret += cvt[c];                }                else                {                    ret += fillchar;                }            }            return (ret);        }       //Method to decrypt the data        static public string Decode(string data)        {            string ret = "";            int i;            char c;            char c1;            int len = data.Length;            for (i = 0; i < len; ++i)            {                c = (char)cvt.IndexOf(data);                ++i;                c1 = (char)cvt.IndexOf(data);                c = ((char)((c << 2) | ((c1 >> 4) & 0x3)));                ret += c;                if (++i < len)                {                   c = data;                    if (fillchar == c)                        break;                    c = (char)cvt.IndexOf(c);                    c1 = (char)(((c1 << 4) & 0xf0) | ((c >> 2) & 0xf));                    ret += c1;                }                if (++i < len)                {                   c1 = data;                    if (fillchar == c1)                        break;                    c1 = (char)cvt.IndexOf(c1);                    c = (char)(((c << 6) & 0xc0) | c1);                    ret += c;                }           }            return (ret);        }    }}`

In the above code there are two methods, Encode() which encrypts the string passed to it and Decode() which decrypt the encrypted string passed to it.

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