Entropy Source Validation; Introduction; Validation Conditions; Data Collection - ST STM32F423 Reference Manual

RM0430
16.7

Entropy source validation

16.7.1

Introduction

In order to assess the amount of entropy available from the RNG, STMicroelectronics has
tested the peripheral against AIS-31 PTG.2 set of tests. The results can be provided on
demand or the customer can reproduce the measurements using the AIS reference
software. The customer could also test the RNG against an older NIST SP800-22 set of
tests.
16.7.2

Validation conditions

STMicroelectronics has validated the RNG true random number generator in the following
conditions:
•
RNG clock rng_clk= 48 MHz (CED bit = '0' in RNG_CR register) and rng_clk= 400kHz
(CED bit="1" in RNG_CR)
•
AHB clock rng_hclk= 60 MHz
16.7.3

Data collection

If raw data needs to be read instead of pre-processed data the developer is invited to
contact STMicroelectronics to receive the correct procedure to follow.
True random number generator (RNG)
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