Private keys are used to create signature for various uploading and admin APIs.
Keep your private key secure and never share them. In case you believe your private(secret) key have been compromised, immediately contact us on firstname.lastname@example.org
Where to find public, private(secret) keys in dashboard?
Go to Developer section in the dashboard - https://imagekit.io/dashboard#developers
You'll see the Public Key and the Private Key along with the date the keys were created on. Click on the 'eye' icon to reveal the Private Key.