A primary-source walk through intercepting a mobile app's backend: proxying TLS, why certificate pinning stops you, how runtime unpinning works conceptually, and decoding schema-less protobuf payloads.
A reference on touch dynamics as a behavioral biometric: the raw signals a phone exposes (pressure, contact area, velocity, curvature, tap timing), the features built on top of them, and how the same signals drive auth and bot detection.
How DeviceMotion and DeviceOrientation readings separate a handheld phone from an emulator, why flat or looped sensor streams give automation away, and how the iOS and Android permission models gate the whole signal.
A primary-source walk through decoding undocumented binary protocols: the protobuf wire format byte by byte, why a schema-less payload is still half-readable, MessagePack's self-describing prefixes, gRPC framing, and the tooling that reconstructs structure.