Comments on: Encrypting and Decrypting a C# string

By: Ales

Ales — Sat, 04 Jun 2011 10:24:27 +0000

Hi,

Thanks for the code… I must say I did not experience any errors decrypting any of my messages. I even tried “wwwrw” with salt “jomaih” as well as various strings containing spaces and all worked well.

By: Kiran Tailor

Kiran Tailor — Fri, 13 May 2011 06:28:57 +0000

Hi,

Great encrypt and decrypt by TripleDES algoritham.

Thanks.

I tried with RijndaelManaged algoritham, that’s also working fine.

By: bian

bian — Thu, 17 Mar 2011 02:18:12 +0000

how to get passphase if i have encrypt and decrypt string??
Thanks alot

By: Edson Catugy

Edson Catugy — Fri, 11 Feb 2011 17:44:20 +0000

Very useful information!!

By: An

An — Sun, 23 Jan 2011 05:32:37 +0000

another issue that if message string contain special characters then Error occurs

Example: message=”Ñ³÷YïÁ¡g/”;

Invalid character in a Base-64 string

// Step 4. Convert the input string to a byte[]
byte[] DataToDecrypt = Convert.FromBase64String(Message);

By: Samir

Samir — Sun, 16 Jan 2011 10:06:22 +0000

Thanks a lot for nice and easy to use functions.

By: Jon Berenguer

Jon Berenguer — Fri, 05 Nov 2010 21:54:12 +0000

Thanks for the Post.
I started to get some errors when the encrypted message had a space character into.

After doing some research, it seems that the convert part in step 4 of the decryption method does not like spaces.

Before step 4, I replace the space to a “+”, according to other sources the plus sign is the same as a space and it works perfectly.

// Step 3. Setup the decoder
TDESAlgorithm.Key = TDESKey;
TDESAlgorithm.Mode = CipherMode.ECB;
TDESAlgorithm.Padding = PaddingMode.PKCS7;

//Fix for base64 error when message has a space, This is the line of code to add
Message = Message.Replace(” “, “+”);

// Step 4. Convert the input string to a byte[]
byte[] DataToDecrypt = Convert.FromBase64String(Message);

By: Osama Mortada

Osama Mortada — Sat, 02 Oct 2010 22:59:46 +0000

Hi,

Thanks for this tutorial it’s really good but sometimes I get this error:

// Step 4. Convert the input string to a byte[]
byte[] DataToDecrypt = Convert.FromBase64String(Message);

Invalid length for a Base-64 char array.

I tried it with this string “wwwrw”
secret string “jomaih”

Thank you,

By: Vance

Vance — Sat, 11 Sep 2010 00:16:49 +0000

Thanks! Good to find simple encryption techniques for stings, as they are useful for keeping cookies private. Many other pages just deal with https instead of manually encrypting strings.

By: Jon Berenguer

Jon Berenguer — Mon, 09 Aug 2010 22:29:05 +0000

Thanks for the lesson and source code. While using the above codes I experience some errors decrypting some messages, especially when it contained some spaces. After searching the internets, I found a fix. Apparently when converting from a Base64 string to byte, it does not like the space in the message. I inserted this line of code, in between Step 3 and 4 for the decrypt method:

Message = Message.Replace(” “, “+”);

Hope this helps others who experience this issue.