Encryption and Decryption
The System.Security.Cryptographic namespace within the Microsoft .NET Framework provides a variety of tools to aid in encryption and decryption. The CryptoStream class is used here to demonstrate the encryption and decryption with System.Security.Cryptographic.SymmetricAlgorithm, such as DESCryptoServiceProvider, RC2CryptoServiceProvider, and RijndaelManaged classes.
I have searched the Internet for some samples and all I found were based on the Microsoft sample code in KB Article Q307010, which basically uses input/output files as source and destination. I would like to have the encryption and decryption done in memory without having to specify source and destination files, so that I could use the code on a web server or so.
After I posted the original code, I found some interesting things about .NET System.Security.Cryptographic.SymmetricAlgorithm classes that they are not able to handle characters which are special to Url. (Don't know why). Therefore, I modified the source code to make it work. I have received a lot of emails regarding "Bad Data" exceptions, when some special characters are contained in the data or key. I emailed my updated code back, but haven't updated the code posted here. Looks like I have to update the code here as well.
For any questions, please contact me at: fangfrank@hotmail.com and I would be happy to answer them a.s.a.p.
Revision History
26 Jun 2002 - Initial Revision
