From device-side risk detection to a policy closed loop: designing a risk-control SDK, scoring engine, and investigation agent end to end, with the setup and commands all covered.
Reverse engineering an iOS device-registration request, decoding the parameters the device sends during enrollment to register with a service, with the algorithm recovered in detail.
Analyzing the mtop device risk-control SDK: its jailbreak detection, VMP layer, and multi-stage encryption, broken down end to end, with every step broken down clearly.
Analyzing the mtgsig 2.4 signing algorithm, reverse engineering Meituan's risk-control signature to understand its protocol and parameters, and the gotchas flagged along the way.