Historical security lesson: side channels keep returning through the door we did not think to measure.
For years we have seen timing attacks, cache attacks, speculative execution issues, GPU fingerprinting, and now ideas around SSD activity. The pattern is familiar: the system does not expose the information directly, but it exposes a side effect stable enough to infer something.
This is a critical lesson for platform engineers: a sandbox is not only a list of blocked APIs. A sandbox is a model of observation. What can untrusted code measure? At what resolution? How much noise exists? Can multiple weak signals combine into a strong one?
Historically, good defenses arrived when browsers and operating systems reduced precision, added isolation, and broke assumptions about shared resources. But every generation of hardware and software creates new measurement surfaces.
Practical checklist:
- Treat telemetry as an attack surface, not only permissions.
- Test combinations of signals, not just individual APIs.
- Remember that performance optimization and privacy protection often pull in opposite directions.
History teaches the same lesson again and again: if a signal exists, someone will try to turn it into an information channel.
Originally posted on LinkedIn: https://www.linkedin.com/feed/update/urn:li:share:7467085886510419968
