Platform Configuration Registers
Will Arthur, David Challener, Kenneth Goldman · Apress eBooks · 2015
Platform Configuration Registers (PCRs) are one of the essential features of a TPM. Their prime use case is to provide a method to cryptographically record (measure) software state: both the software running on a platform and configuration data used by that software. The PCR update calculation, called an , is a one-way hash so that measurements can’t be removed. These PCRs can then be read to report their state. They can also be signed to return a more secure report, called an (or quote ). PCRs can also be used in an extended authorization policy to restrict the use of other objects. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.