Man pages matching name math::random::secure::rng in section 3pm:

Math::Random::Secure::RNG.3pm.en	debian 10 / libmath-random-secure-perl
Math::Random::Secure::RNG.3pm.en	debian 11 / libmath-random-secure-perl
Math::Random::Secure::RNG.3pm.en	debian 12 / libmath-random-secure-perl