The paper constructs an involution pennutation with 128 bits long by using the MA - structure in IDEA and simply analyses its properties. Finally , a sort of secret 一key block cipher is constructed with the help of this involution pennutation.
[8]ZHAO Geng,CHEN Guanrong,FANG Jingqing,XU Gang .Key Laboratory of Information Security , Secrecy,Beijing Electronic Science , Technology Institute,Beijing ,China.Block Cipher Design:Generalized Single-Use-Algorithm Based on Chaos[J].Tsinghua Science and Technology,2011(2):194-206.