[1] CNR, Ist Sci & Tecnol Informaz A Faedo, Pisa, Italy
[2] Handong Global Univ, Sch Comp Sci & Elect Engn, Pohang, South Korea
[3] Purdue Univ, Dept Comp Sci, W Lafayette, IN 47907 USA
[4] Singapore Univ Technol & Design, Ctr Res Cyber Secur, Singapore, Singapore