Masayuki Kanda Practical Security Evaluation against Differential and Linear Cryptanalyses for Feistel Ciphers with SPN Round Function. 324-338 2000 conf/sacrypt/2000 Selected Areas in Cryptography http://link.springer.de/link/service/series/0558/bibs/2012/20120324.htm db/conf/sacrypt/sacrypt2000.html#Kanda00