You should first learn how bitcoin and by extension cryptography works then try to report a "problem" with the protocol. Based on your comments so far it doesn't look like you have a firm grasp on the technology yet and things you think are "problems" and as you put it earlier "a critical security flaw" are just your lack of knowledge.

You shouldn't waste other people's time but here is all you need to do in order to report a bug to bitcoin developers: https://bitcoin.org/en/bitcoin-core/contribute/issues