Jiali Choy Guanhan Chew Khoongming Khoo Huihui Yap Cryptographic Properties and Application of a Generalized Unbalanced Feistel Network Structure. 73-89 2009 ACISP http://dx.doi.org/10.1007/978-3-642-02620-1_6 conf/acisp/2009 db/conf/acisp/acisp2009.html#ChoyCKY09