A couple of days ago, an individual attempted to convince me that the National Security Agency is capable of cracking Rijndael encryption; as a response, I informed the individual of the infeasible nature of the factoring of extremely large semiprimes; however, my attempts were futile, as the individual believes that NSA possesses sufficient power to crack this encryption without intercepting the transmission of the corresponding private key.
The Dunning-Kruger effect is real; although this individual tends to be logically-minded, there does exist an exception to this good behaviour.

"It is easier to square a circle than get 'round a mathematician."