Bingke Ma Bao Li 0001 Ronglin Hao Xiaoqian Li Cryptanalysis of Reduced-Round Whirlwind. 20-38 2015 ACISP https://doi.org/10.1007/978-3-319-19962-7_2 conf/acisp/2015 db/conf/acisp/acisp2015.html#MaLHL15