Based on the investigation of the filtered key stream generator family F-FCSR using feedback with carry shift register(FCSR)as components,especially the reason what makes F-FCSR-Hv2 key stream generator failed,a dynamic filtered generator named DF-FCSR-8 was presented.This generator avoids Hell-Johansson attack and its key stream sequences can pass the test of NIST's suit STS.Finally,it can also resist many other attacks
