Noriaki Hashimoto Shoko Imaizumi Masaaki Fujiyoshi Hitoshi Kiya Hierarchical encryption using short encryption keys for scalable access control of JPEG 2000 coded images. 3116-3119 2008 ICIP http://dx.doi.org/10.1109/ICIP.2008.4712455 conf/icip/2008 db/conf/icip/icip2008.html#HashimotoIFK08