Amr M. Youssef Cryptanalysis of the ``Augmented Family of Cryptographic Parity Circuits'' Proposed at ISW'97. 29-38 2000 conf/sacrypt/2000 Selected Areas in Cryptography http://link.springer.de/link/service/series/0558/bibs/2012/20120029.htm db/conf/sacrypt/sacrypt2000.html#Youssef00