Zhimin Chen Syed Haider Patrick Schaumont Side-Channel Leakage in Masked Circuits Caused by Higher-Order Circuit Effects. 327-336 2009 ISA http://dx.doi.org/10.1007/978-3-642-02617-1_34 conf/sersc-isa/2009 db/conf/sersc-isa/isa2009.html#ChenHS09