Security issue with AES_Crypto.cs and licensing issues

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I'm not sure in what context the class is used, but the method of encryption in Fido/Fido_Support/Crypto/AES_Crypto.cs is insecure, as outlined by this StackOverflow question.

Also, there is no recognition of the original author of the class, which I believe is copied almost verbatim from this StackOverflow answer. The original author should get recognition, even if it is a bugged implementation. Copying it directly and adding your own copyright notice on it is in direct violation of its license, Creative Commons, under which all StackOverflow content is licensed.

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It appears the file has been removed not two hours after I posted this. This resolves both issues.