client-side-trust-boundary
Skill9 starsChanged 4 months agoLicence not identifiedView on GitHub
Treat any code or data that runs on a device the user controls as code and data the adversary controls — the mobile app, the single-page app, the desktop client, the game — because the user can root the phone, hook it with Frida, bypass the certificate pin, read the "encrypted" local database, and patch out any check you shipped, so a security decision made client-side is a suggestion, never a control. Use whenever the subject is a client that runs on hardware you do not own: "is it safe to store this in the app", "we validate on the client", "the API key is in the mobile app", "cert pinning / SSL pinning", "jailbreak / root detection", "obfuscate the code", "the price/feature-flag/isPremium is checked in the app", "reverse engineering our app", "IDOR/BOLA in the mobile API". Sibling of validate-at-the-boundary (this is its client-side corollary — the server must re-make every decision) and agent-trust-boundaries (an untrusted execution context); it maps what you wrongly trust on the far side. It does not write the mobile app or the server, and never accepts a client-side check, secret, or obfuscation as a security property.
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