@conference { , title = {On Permutation Operations in Cipher Design}, year = {2004}, month = {April 5-7, 2004}, pages = {569-577}, address = {Las Vegas, Nevada, USA}, URL = {http://palms.ee.princeton.edu/PALMSopen/lee04permutation.pdf}, author = {Lee, Ruby B. and Rivest, R L and Robshaw, M J B and Shi, Z J and Yin, Y L} }