using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Security;

 using System.Text;

 using System.Threading.Tasks;

 namespace SharpDisplayManager

 {

     /// <summary>

     /// As per: http://weblogs.asp.net/jongalloway/encrypting-passwords-in-a-net-app-config-file

     /// </summary>

     class Secure

     {

         static byte[] entropy = System.Text.Encoding.Unicode.GetBytes("kd566slqfjls234895DFG743fqdlskj345SDFDepozwxc,n*ù^$^é");

         public static string EncryptString(System.Security.SecureString input)

         {

             byte[] encryptedData = System.Security.Cryptography.ProtectedData.Protect(

                 System.Text.Encoding.Unicode.GetBytes(ToInsecureString(input)),

                 entropy,

                 System.Security.Cryptography.DataProtectionScope.CurrentUser);

             return Convert.ToBase64String(encryptedData);

         }

         public static SecureString DecryptString(string encryptedData)

         {

             try

             {

                 byte[] decryptedData = System.Security.Cryptography.ProtectedData.Unprotect(

                     Convert.FromBase64String(encryptedData),

                     entropy,

                     System.Security.Cryptography.DataProtectionScope.CurrentUser);

                 return ToSecureString(System.Text.Encoding.Unicode.GetString(decryptedData));

             }

             catch

             {

                 return new SecureString();

             }

         }

         public static SecureString ToSecureString(string input)

         {

             SecureString secure = new SecureString();

             foreach (char c in input)

             {

                 secure.AppendChar(c);

             }

             secure.MakeReadOnly();

             return secure;

         }

         public static string ToInsecureString(SecureString input)

         {

             string returnValue = string.Empty;

             IntPtr ptr = System.Runtime.InteropServices.Marshal.SecureStringToBSTR(input);

             try

             {

                 returnValue = System.Runtime.InteropServices.Marshal.PtrToStringBSTR(ptr);

             }

             finally

             {

                 System.Runtime.InteropServices.Marshal.ZeroFreeBSTR(ptr);

             }

             return returnValue;

         }

     }

 }