Momen, NurulFritsch, LotharReinhardt, DelphineLangweg, HannoWitt, Bernhard C.Fischer, Mathias2020-02-042020-02-042020978-3-88579-695-4https://dl.gi.de/handle/20.500.12116/31778Smartphone apps that run on Android devices can access many types of personal information. Such information can be used to identify, profile and track the device users when mapped into digital identity attributes. This article presents a model of identifiability through access to personal data protected by the Android access control mechanism called permissions. We present an abstraction of partial identity attributes related to such personal data, and then show how apps accumulate such attributes in a longitudinal study that was carried out over several months. We found that apps' successive access to permissions accumulates such identity attributes, where different apps show different interest in such attributes.enPrivacyAndroidAppsIdentificationDigital IdentitySurveypermissionsText/Conference Paper10.18420/sicherheit2020_011617-5468