Kyoji Shibutani Takanori Isobe Harunaga Hiwatari Atsushi Mitsuda Toru Akishita Taizo Shirai Piccolo: An Ultra-Lightweight Blockcipher. 342-357 2011 CHES http://dx.doi.org/10.1007/978-3-642-23951-9_23 conf/ches/2011 db/conf/ches/ches2011.html#ShibutaniIHMAS11