A good blog entry on the topic: http://blog.cryptographyengineering.com/2012/02/multiple-encryption.html http://blog.cryptographyengineering.com/2012/02/multip

A good blog entry on the topic: http://blog.cryptographyengineering.com/2012/02/multiple-encryption.html http://blog.cryptographyengineering.com/2012/02/multiple-enc...