How to encrypt documents/files

I see that nopCommerce uses the encryption key at General and Miscellaneous Settings > Security Settings tab to store credit card data.  Is there a way to create a custom dB column for documents/files, and use the same process/key for storing encrypted documents?  Or, is there a plug-in available for storing encrypted docs. in the file directory of web site?

Thank you!

You could loop through a byte[] and call _encryptionService.Encrypt() on each one and store that.  I'm not sure if that would be the most efficient way, though.