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A TPM (trusted platform module) is a chip present mostly on newermotherboards, and its primary function is to create, store and work withcryptographic keys. This dedicated chip can serve to authenticate other devicesor to protect encryption keys used by various software applications. Amongother features, it comes with a True Random Number Generator (TRNG) that can beused for cryptographic purposes. This random number generator consists of astate machine that mixes unpredictable data with the output of a one way hashfunction. According the specification it can be a good source of unpredictablerandom numbers even without having to require a genuine source of hardwareentropy. However the specification recommends collecting entropy from anyinternal sources available such as clock jitter or thermal noise in the chipitself, a feature that was implemented by most manufacturers. This paper willbenchmark the random number generator of several TPM chips from twoperspectives: the quality of the random bit sequences generated, as well as theoutput bit rate.

Benchmarking the True Random Number Generator of TPM Chips