| 摘要 |
PCT No. PCT/FR95/01061 Sec. 371 Date Apr. 23, 1997 Sec. 102(e) Date Apr. 23, 1997 PCT Filed Aug. 8, 1995 PCT Pub. No. WO96/05548 PCT Pub. Date Feb. 22, 1996The invention relates to protected keypad apparatus, in particular for machines actuated by insertion of an electronic smart card. The keypad proper (10) comprises n sensitive zones (Zi), each sensitive zone being associated with a respective sensor and with an individual processing circuit (14i) that includes in particular an encryption function. The sensor and the circuit form a monolithic unit. The apparatus further includes a driver unit (18) connected to each circuit (14i) via a bus (16). The circuits periodically and cyclically transmit encrypted signals indicating activation or non-activation of the sensitive zones. |
