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Setracker2 Android Companion App com.tgelec.setracker versions 3.1.5 and prior only require the password hash when authenticating with backend services from the client.
The Setracker2 Android Companion App (com.tgelec.setracker) versions 3.1.5 and earlier uses MD5 to generate a request signature for authenticating communications between the mobile client and the backend REST API.
Setracker2 Android Companion App com.tgelec.setracker versions 3.1.5 and prior encrypts requests between the watch and its backend with static hardcoded AES keys and initialization vectors.
Setracker2 Android Companion App com.tgelec.setracker versions 3.1.5 and prior have a predictable registration ID derived from IMEI.