It wouldn't hurt if cppreference.com would be more clear about this. Instead of "It produces high quality unsigned integer random numbers" , it should say "high quality, but not cryptographically secure, ".

https://en.cppreference.com/w/cpp/numeric/random/mersenne_twister_engine

It doesn't help that it links to a standards document which in its Requirements section mentions:

> "true" non-deterministic random numbers (for cryptography)

https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2002/n1398.html

Only if you read the document carefully you'll learn why that requirement was pushed to the developer.