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There's a nice article here: http://www.matasano.com/articles/javascript-cryptography/ http://www.matasano.com/articles/javascript-cryptography/ that explains

• saurik 14y ago
  Note: these arguments only apply to JavaScript in a browser (and at that point, apply to virtually any client-side system attempting to somehow protect information from being snooped on by the server that dynamically provides the code to execute on the client <- an idea that should have been preposterous from the start ;P).