Hardware Reference
In-Depth Information
Trusting computing devices with a Trusted
Platform Module
The Trusted Platform Module ( TPM ) performs the RSA algorithm on the chip. However,
it is much more capable than just an encryption chip. The TPM specification is developed
and maintained by the Trusted Computing Group ( TCG ), an international industry stand-
ards body.
TPMs are included on several major vendor laptops including Dell, HP, and even Google
Chromebooks. On laptops, TPMs are normally found in the Low Pin Count ( LPC ) pack-
age and are enabled via the BIOS. Embedded devices typically don't support the LPC bus;
the TPM on the CryptoCape communicates over the I2C bus.
The software interface to the TPM is via the Trusted Computing Group Software Stack
( TSS ). In Linux, the TSS is provided by the TrouSerS package. In the next chapter, we'll be
using the TPM and also take a closer look at the TPM on the CryptoCape.
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