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“.
But wait, there's more
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You forgot "deliberately mislead innocently interested parties by telling them the exact opposite of the truth."