You can read more details about the algorithms/protocols here: https://www.calctopia.com/2017/02/01/on-the-security-model/

I don't agree with the statement "because is open-source is more secure"; for example, OpenSSL has been open-source for almost 20 years and it's difficult to consider it really secure. Only code reviews by experts make software more secure.

BTW: quoting Harry Potter doesn't make you look serious.