Signing‑Key Breaches Enable Stealth Takeovers

When an open‑source app’s developer signing keys are stolen, attackers can push signed malicious updates that evade platform heuristics and run native, stealthy backends on millions of devices. The problem combines weak key management, opaque build pipelines, and imperfect revocation mechanisms to create a high‑leverage vector for long‑running device compromise. — This raises a policy conversation about mandatory key‑management standards, fast revocation workflows, attested build chains, and platform responsibilities (Play Protect, F‑Droid, sideloading) to prevent and mitigate supply‑chain breaches.