adjective
privy
PRIV-ee/ˈprɪvi/
Aware of confidential information.
Only a few employees are privy to the merger plans.

Etymology
From “private, personal,” privy came to mean “secret, not publicly known.” Being privy to something then meant participating in that secret: knowing what is withheld from others.
In context
you have the sense that you're privy to this knowledge that nobody else knows about
More examples
- I'm not privy to their private conversations.
- Her lawyer is privy to the details of the settlement.
- Anyone privy to the access code must keep it confidential.