f8 Keystream Generator with SMS4 as Core Algorithm

Since KASUMI algorithm is forbidden to use commercially in China, a new f8 keystream generator is presented by using SMS4 as core algorithm in this paper. Then the new f8 is implemented in software to produce 100 groups 20000-bit keystreams with different cipher keys. Later, FIPS 140-2 is applied to these keystreams to test randomness. Based on the data obtained, six figures are drawn to specify the results of FIPS 140-2 test. From these figures, the keystreams obtained exhibit excellent statistical properties. Conclusions are made that the f8 have passed the monobit test, the poker test, the runs test and the long runs test of FIPS 140-2. Therefore, in term of randomness, the new f8 can be used safely in Chinese 3G communication system.