Integrated circuit identification system

Integrated circuit identification system

An improved integrated circuit including decryption functions employs a method for determining if its environment has been modified, by providing a first VCXO as part of the integrated circuit, providing a second VCXO, adjusting one of the VCXOs in a first preselected manner, determining a first fre...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
1. Verfasser: LACZKO, SR. FRANK L
Format: Patent
Sprache:eng
Schlagworte:
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
INFORMATION STORAGE
PHYSICS
STATIC STORES
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Beschreibung
Zusammenfassung:An improved integrated circuit including decryption functions employs a method for determining if its environment has been modified, by providing a first VCXO as part of the integrated circuit, providing a second VCXO, adjusting one of the VCXOs in a first preselected manner, determining a first frequency count of the adjusted VCXO during a first preselected time interval using the other VCXO, adjusting the one of the VCXOs in a second preselected manner, determining a second frequency count of the adjusted VCXO during the first preselected time interval using the other VCXO, averaging the first and second frequency count to provide an average frequency count, adjusting the average frequency count in a predetermined manner, and comparing the adjusted average frequency count to a previously stored, determined, or provided average frequency count to determine if the environment of the integrated circuit has been modified.