[Cryptography] AES Broken?

[Krisztián Pintér]

On Fri, Aug 28, 2015 at 4:59 AM, Ray Dillinger <bear at sonic.net> wrote:
> https://mjos.fi/doc/gavekort_kale.pdf

i'm not entirely sure whether it is trolling, hoax-attempt or joke.
but one interesting use of this article is for the classroom. how many
errors you can collect? the student collecting the most errors wins.
any error spotted by only one student wins some extra points. etc.