What are the valid use cases for client side encryption?

Question

I just read about the Stanford Javascript Crypto Library (jsfiddle example) which supports SHA256, AES, and other standard encryption schemes entirely in javascript. The librar

Answer 1

Like anything on the client, you can use obfuscation to make things more difficult for casual users to peek inside, but since the client would also need to have a copy of the decryptor there's nothing to stop the user from using the decryptor themselves either.

JavaScript is an insecure environment, period.