FAQ: Which CSPRNG is used by OpenSSL in zenon, for e.g. TLS communication?
The OpenSSL version used in zenon is the LTS version 1.1.1. On Windows systems OpenSSL in zenon makes use of the Windows Cryptography API: Next Generation (CNG). For generation of random numbers and seeding of the random number generator, BCryptGenRandom is used with the system preferred source for entropy, which complies with the NIST SP800-90 standard (CTR_DRBG).