A tamper-proof structure for protecting an electronic module, comprising a pattern of signal lines having a highly unpredictable layout, which is an approximation of a space-filling curve obtained by the replication of at least one elementary space element having an inscribed base curve inscribed therein. A sequence of incoming frames of a fixed location delivered over a network are received. The piston includes at least one passageway formed therein. An internal oscillator control register for controlling the operation of the programmable load capacitor array responsive to control bits of the programmable load capacitor array controlled by the processing core.