Computational Forensics 5th International Workshop, IWCF 2012, Tsukuba, Japan, November 11, 2012 and 6th International Workshop, IWCF 2014, Stockholm, Sweden, August 24, 2014, Revised Selected Papers - Garain, Utpal; Shafait, Faisal (Springer International Publishing : Imprint: Springer, 2015)