Ma, Zhen; Tian, ; Qi, Wen-Feng: 'Conditional differential attacks on Grain-128a stream cipher', IET Information Security, 2017, 11, (3), p. 139-145, DOI: 10.1049/iet-ifs.2016.0060 IET Digital Library, https://digital-library.theiet.org/;jsessionid=1j2peo2uao256.x-iet-live-01content/journals/10.1049/iet-ifs.2016.0060