US 7,321,300 B2
Security device for a transponder
Ulrich Friedrich, Ellhofen (Germany); and Dirk Ziebertz, Eberstadt (Germany)
Assigned to Atmel Germany GmbH, Heilbronn (Germany)
Filed on Apr. 14, 2005, as Appl. No. 11/105,551.
Claims priority of application No. 10 2004 018 557 (DE), filed on Apr. 14, 2004; and application No. 10 2005 005 436 (DE), filed on Feb. 05, 2005.
Prior Publication US 2005/0231369 A1, Oct. 20, 2005
Int. Cl. G08B 1/08 (2006.01)
U.S. Cl. 340—539.11  [340/572.1; 340/572.3] 24 Claims
OG exemplary drawing
 
1. A security device for a transponder, the security device comprising:
a security function for a kill and/or cloak function;
a memory device, in which a first password is stored;
an input, into which a second password can be coupled;
a cryptologic device, which is connected to the input and generates a checksum from the second password; and
a comparison device, which compares the checksum and the first password and which, upon their agreement, generates a security control instruction to activate and/or deactivate a security mechanism, which can be tapped at an output.