Don’t tell anyone.
If you must tell anyone, wait until it matters less.
If you tell anyone, ask them to keep it secret and change a few details so that you can tell who spilled the beans.
If you have to discuss something related to your secret, use a secret project name, like “Project Vulcan“.
Matt Katz – More Light! More Light!
Almost completely true
You forgot "deliberately mislead innocently interested parties by telling them the exact opposite of the truth."