Security :: Decryption Error "Length Of The Data To Decrypt Is Invalid"

Jun 14, 2010

I am using encryption/decryption logic from the following link: [URL] Code from this page is working but at times, its throwing an error while decyption as 'Length of the data to decrypt is invalid'. I have a very limited knowledge on this topic so I am no able to troubleshoot it further

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[Exception Info]

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For our website, we have decided we would like to maintain our user passwords as encrypted binary data in our database. We are using ASP.NET 3.5 to host our site and SQL Server Express 2008 for the database, both running on the same server. When a user logs in and submits a username and password, there will need to be some sort of encryption or decryption in order to verify the credentials. To me, it would appear that there are 3 ways to do this:

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Ok this one might be a bit tough to figure out, but each day when users open their application the following error is generated and they can not enter the application: "Failed to decrypt using provider 'EncryptionProvider'. Error message from the provider: The RSA key container could not be opened." Guess what fixes it... I have to open the application 1 time and then all of the users can being to open the application. This is not an issue with the encryption/decryption of the .config never having worked; it works just fine - but not all of the time. It sounds like a permissions issue to me, like me opening the app grants access to the key file for a time period, and the next day the issue starts all over again. Here is what I have already done (actually when I set up encryption originally), as the many, many posts with this issue are resolved with, but none have worked:

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I have these settings.. in my webconfig..

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I am working on encryption and decryption and able to encrypt and decrypt a Text file but not able to do the same for MS Word or any other file other than Text file. I am using a below code.

[Code]....

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