FIngerprint not unique across 2 apps

[omkar-tenkale]

I have 2 apps with different package names communicating with the same server, They are reporting different fingerprints when this library is used

Is the fingerprint also depends on app information and not just system info?

[Alexey-Verkhovsky]

Hello! What is the type of fingerprint you are using and what is the device? There are three types of fingerprints and three device IDs.

For your case GSF ID and Stable fingerprint will be stable across all apps. All others may change when package name changes.

You may extract them using this code:

        val fingerprinter = FingerprinterFactory.create(this)

        fingerprinter.getFingerprint(version = Fingerprinter.Version.V_5, stabilityLevel = StabilityLevel.STABLE) { fingerprint ->
            val stableFingerprint = fingerprint
        }

        fingerprinter.getDeviceId(version = Fingerprinter.Version.V_5) { result ->
            val deviceId = result.gsfId
        }

Hope this helps!

[omkar-tenkale]

I'm using this

FingerprinterFactory.getInstance(context, Configuration(version = 4))
                        .getFingerprint { fingerprintResult ->
                            process(fingerprintResult.fingerprint)
                        }

Seems like I need to go with this as I want a unique deviceId across all apps without bothering about security

 fingerprinter.getFingerprint(version = Fingerprinter.Version.V_5, stabilityLevel = StabilityLevel.STABLE) { fingerprint ->
      val stableFingerprint = fingerprint
}

[Alexey-Verkhovsky]

From what I see I think the following code is the best option for you:

        val fingerprinter = FingerprinterFactory.create(this)

        fingerprinter.getDeviceId(version = Fingerprinter.Version.V_5) { result ->
            val deviceId = result.gsfId
        }

GSF ID is unique and stable across all apps. It may be tampered though, and it doesn't work with non-google devices (e.g. Huawei). If you want to cover all the cases – consider using PRO version.

[omkar-tenkale]

Ok thanks!