07564345 is referenced by 32 patents and cites 77 patents.

A key is determined from a volatile response using circuitry on the device. The volatile response depend on process variation in fabrication of the device. Error control data that depends on the first volatile response can be computed, stored externally to the device, and then used to generate the key using a volatile response using the circuit. Applications of volatile keys include authentication and rights management for content and software.

Title
Volatile device keys and applications thereof
Application Number
11/273920
Publication Number
7564345 (B2)
Application Date
November 14, 2005
Publication Date
July 21, 2009
Inventor
Thomas Ziola
Merlo Park
CA, US
Srinivas Devadas
Lexington
MA, US
Agent
Occhiuti Rohlicek & Tsao
Assignee
Verayo
CA, US
IPC
G08B 1/08
View Original Source