According to many Buddhist tantras and also common Tibetan Buddhist resources, the tantras and the Vajrayana was taught by the Buddha Shakyamuni, but only to some men and women. There are several tales and versions of how the tantras ended up disseminated. Monks attending the 2003 Kalachakra empowerment in Bodhgaya, https://beckettbjors.blogripley.com/33877213/the-fact-about-goldie-madan-is-world-famous-tantrik-that-no-one-is-suggesting