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Serializing to a binary file with encyrption

Posted By:      Posted Date: April 10, 2011    Points: 0   Category :WPF

I'm serializing datas in my  database to a binary file and used Rijndael for encryption. My application was working very fine when I just serialize to a binary file and now it's extremely slow with encyrption.

Speed is important and also have to be sure that my data can't be open by others.

 I didn't use any other encryptions before and very upset now with Rijndael. 

 Which method should I use so that others can't read these serialized binary files?

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