Make your electronics tamper-evident

Warranty seals and consumer devices

• Users report hidden screws sealed with wax or stickers in appliances and hard drives, likely for warranty/tamper evidence.
• One commenter notes that in the US, “warranty void if removed” stickers can’t legally void the entire warranty; only damage you caused can be excluded.
• Others point out that opening hard drives is inherently destructive: cleanliness, air/helium filling, and hermetic welding mean any opening counts as damage.
• People share past hacks (e.g., heating stickers with a hairdryer to preserve them) as examples of how easy it can be to defeat basic seals.

Random patterns, physical fingerprints, and PUFs

• Several comments connect glitter/nonpareil patterns to broader work on anti-counterfeiting: pills with random sprinkles, banknote fibers, metallic-particle adhesive tags, and nanoscale-diamond “dust” IDs.
• Physical unclonable functions (PUFs) and similar constructs are mentioned as “physical cryptography” analogs.
• Discussion of algorithms to robustly encode and search these random patterns (image fingerprinting, wavelets, fuzzy hashes, neural nets) notes that current image-similarity tools aren’t ideal.
• Skeptics argue that with enough budget, attackers could build “sprinkle printers” or robotic pattern replicators; others counter that precise duplication of many tiny elements is still very hard.

Threat models and who needs tamper evidence

• Use cases raised: investigative journalists, dissidents, cryptographers, security researchers, and services needing strong randomness.
• Stories include hotel room intrusions, targeted state surveillance and spyware, and even alleged pre-delivery hardware keyloggers.
• Some argue most people are more at risk from ordinary thieves than intelligence services; others stress corrupt or abusive police in various countries as realistic adversaries.
• One view: the value of tamper evidence is often detection and attribution (who’s interested in you), not perfect protection.

Techniques, tools, and limitations

• Suggestions range from glitter/epoxy on screws and Framework ports to tamper-evident bags, security tapes, and built-in case-open switches tied to TPMs.
• DoD and other standards treat many label seals as “minimal” security; well-resourced actors can counterfeit even official seals.
• Multiple people emphasize that such techniques require frequent inspection and are inconvenient, and cannot meaningfully stop top-tier nation-state actors—only raise the bar and provide evidence.