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PilferShush Jammer

Research and project page : https://www.cityfreqs.com.au/pilfer.php

Android microphone checker and jamming application built for AOSP LineageOS.

Application for low battery requirement microphone passive jamming.

Calls audioRecord.startRecording() but DOES NOT READ THE AUDIO BUFFER.

Holds microphone access and should block user apps from gaining focus of microphone.

System telephone calls will override and bump the Jammer from the microphone.

Adds a notification as a reminder for running while in background.

Tested and blocks Google Voice search (user) app (up to API 34). Currently testing Chrome/Omnibox/Assistant app voice blocking.

Active jammer - tone and white noise versions, boost EQ for higher amplitude.

Scan user installed apps for key features, possible NUHF/ACR SDK package name matches and services/receivers running.

Jammers run as an instance of MediaRecorder in a foreground service

Note: Android 11 (API 30) changes to foreground services access to microphone - "while-in-use access" only. see https://developer.android.com/about/versions/11/privacy/foreground-services

Note: Android 12 (API 31) has new concurrent audio capture policy see https://source.android.com/compatibility/12/android-12-cdd#54_audio_recording

Note: APK app bundle will be necessary thing for Google Play Store, apk maintained here for FDroid

Note: Microphone source switch setting from VOICE_COMM to DEFAULT will cause passive jammer to lose concurrent audio focus and stop blocking the microphone

Notes: For Android 12 (https://source.android.com/compatibility/12/android-12-cdd?hl=sr#54_audio_recording) 5.4.5. Concurrent Capture C-1-1 MUST allow concurrent access to microphone by an accessibility service capturing with AudioSource.VOICE_RECOGNITION also: C-1-3 ... another app can capture the voice call if it is a privileged (pre-installed) app with permission CAPTURE_AUDIO_OUTPUT.

TODO:

Build:

Changes:

App screenshots:

Active Jammer frequency analysis:

2023 Kaputnik Go

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

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