There is no such thing as "MD5 Encryption" if you take a 4GIG file and run it though MD5 you will get a 32byte string that is HASHING not Encryption.
It is also non reversible you cannot take a MD5 string and reverse MD5 it into the original plain text its a 1 way hashing algorithm which is why its so popular for use in passwords. You cant "MD5" the HTTP headers for a start it would require the users browser to send you the data in MD5 and even if it did you wouldn't be able to go back to the original value and it would NOT fix the problem at hand it would still store and execute the JavaScript.
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