World's most mysterious book may be a hoax | Nature
Message extraction using a Cardan grille | Download Scientific Diagram
A homeless man gave this to my gf at her work; possibly just schizophrenic plaintext but there's something off about it; possibly Pig Latin, Acrostic, Trevanion, Cardan Grille, Boustrophedon, AMSCO, Substitution, Spiral,
Turn AMC on X: "Secret messages were passed using a Cardan Grille during the #TURNrevolution. Learn more: http://t.co/Vij28p49JX http://t.co/bU1u7etRqq" / X