Jean Paul Degabriele, Victoria Fehr, Marc Fischlin, Tommaso Gagliardoni, Felix Günther, Giorgia Azzurra Marson, Arno Mittelbach, Kenneth G. Paterson. Unpicking PLAID. A cryptographic analysis of an ISO-standards-track authentication protocol.
Upon public release in 2009 PLAID was claimed to have been the subject of three years' cryptanalysis by the then Defence Signals Directorate. With that in mind the sections at the end of the paper about misuse of CBC are more concerning than the exploitation of shrill keys.