Famous apocryphal story: cryptographer tells amateur cipher designer 'In each of these 3 envelopes is an attack against your cipher. Open one and check it. Then find the other two by yourself.' Amateur is never heard from again.
Surely the cryptographer in this story could have cheated by putting the same attack in each envelope!
Done properly, there should have been 4 envelopes. Open any two, check they are (a) attacks, (b) not the same as each other. Then go look for the remaining two.
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