Matteo Centenaro Riccardo Focardi Flaminia L. Luccio Graham Steel Type-Based Analysis of PIN Processing APIs. 53-68 2009 ESORICS http://dx.doi.org/10.1007/978-3-642-04444-1_4 conf/esorics/2009 db/conf/esorics/esorics2009.html#CentenaroFLS09