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I want to create an android app, which uses firebase as datastore and has users and groups of users. Each group has a list with the containing users unique user-id.

Is it a good idea to share the user-id to all group-members, if i use anonymous authentication? I mean, is the user-id the only credential, a device with anonymous anthentication logs in with to the firebase? If that would be so, some other could login with another user id.

Noch Irgendetwas
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  • The value you're referring to is called a UID (short for User ID). It identifies a user, but does not authenticate them: knowing someone's UID does not allow you to authenticate as that user. So a UID can (and likely must) be shared freely without introducing a security risk. I've answered this before, so will look for the duplicate. – Frank van Puffelen Jan 03 '17 at 18:20
  • Thank you! You helped me much! – Noch Irgendetwas Jan 03 '17 at 19:32

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