If an unsigned app asks for access to your keychain on Mac
If an app is not signed, it’s not possible to securely verify its authenticity or the authenticity of any updates to it. When you open an unsigned app, Keychain Access requests your permission to provide the password to the app.
Choose one of the following:
Allow Once: Grant access this time only. You’ll be asked again the next time the application needs the password.
Always Allow: Let the app retrieve the password from your keychain without any further authorization or notice from you. Because the authenticity of this app cannot be verified, if you select this option it’s possible for another app to gain access by mimicking this app.
Deny: Prevent the app from retrieving the password from your keychain. You need to enter the password manually.