Politechnika Warszawska

Piotr Wieczorek

Krzysztof Golofit

Generator of physically unclonable cryptographic keys (PUF) has two adjustable speed ring oscillators (GPRS, GPRS'), which outputs (o-GPRS, o-GPRS&#x2032;) are connected to inputs (i-DF, i-DF) of a phase detector (DF), which output (o-DF) is connected to control inputs of the adjustable speed ring oscillators (s-GPRS, s-GPRS&#x2032;) through a control system (US) and is also connected to a output (o-PUF) of the generator of physically unclonable cryptographic keys (PUF) through a sample and compare circuit (URP). Generator has a initializing input (i-UCH) connected to both initializing inputs of the adjustable speed ring oscillators (i-GPRS, GPRS&#x2032;) and to the first input of the sample and compare circuit (i-URP), which second input (z-URP) is connected to the output (o-GPRS&#x2032;) of one of adjustable speed ring oscillators (GPRS&#x2032;).

Generator of physically unclonable cryptographic keys

Random number generator (GL) comprising adjustable speed ring oscillators (GPRS, GPRS'), which have outputs (o-GPRS, o-GPRS&#x2032;) connected to inputs (i-UM, i-UM) of a metastability circuit (UM) and inputs (i-DF, i-DF) of a phase detector (DF), which outputs (o-UM, o-DF) are connected to inputs (r-US&#x2032;, i-US&#x2032;) of a control circuit (US&#x2032;), having output (o-US&#x2032;) connected to control inputs (s-GPRS, s-GPRS&#x2032;) of the adjustable speed ring oscillators (GPRS, GPRS&#x2032;). The outputs (o-UM, o-DF) of the metastability circuit (UM) and the phase detector (DF) are being outputs (o-GL, o-GL) of the random number generator (GL).

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Warsaw, Poland

Piotr Wieczorek