Cyber Security Expo
Distinguishing attack on FastFlex stream cipher by Mohammad Ali Orumieh Chi Ha on 25/07/07

The overall structure of FastFlex is given in Fig. 1. FastFlex uses a Hash Function as its core, and a 256◊256 sbox as a nonlinear layer. In each round, 256 bits is generated by sbox output and this process will be continued. We donít discuss about hash core and focus on the sbox.

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