KU Student and Professor Coauthor Paper in Journal

KU junior Isaac Reiter, Fleetwood, Pa., and associate professor Dr. Eric Landquist, mathematics, coauthored a paper that appeared in CONTACT (Communications on Number Theory and Combinatorial Theory). Titled, "Determining Biases in the Card-Chameleon Cryptosystem," their paper explains how there are over 225 bits of entropy in a well-shuffled deck of cards. Theoretically, this can provide enough security to rival modern computer-based cryptosystems. Reiter and Landquist describe and analyze one such playing card cipher, Card-Chameleon. Their analysis reveals new weaknesses in this cryptosystem, particularly the tendency for a letter to encrypt to itself.

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