Most security focuses either on the app itself (client-side) or the database (server-side). However, the connection between them — the API — is where most attacks happen. Hackers use bots, emulators, and tampered apps to trick your server into handing over data.
The Solution: A Two-Pillar Defense
To close this gap, you need two layers working together:
1. Hardening the Client (RASP)
Think of Runtime Application Self-Protection (RASP) as a bodyguard inside your app.
- What it does: It monitors the app while it’s running. If it detects someone trying to “hook” into the code, use a debugger, or run the app on a jailbroken device, it can shut the app down or block specific actions.
- Why it matters: It makes it much harder for hackers to reverse-engineer your app to find your API secrets.
2. Validating the Connection (App Attestation)
Even a hardened app can be bypassed. App Attestation is the “digital ID card” that proves to the server that the request is coming from your original, unmodified app.
- The “Verdict”: Instead of just blocking or allowing, attestation gives the server a “trust score.”
- High Trust: Proceed as usual.
- Medium Trust: Trigger a “step-up” (like asking for MFA).
- Low Trust: Block the request and log the bot activity.
Key Benefits of App Attestation
Moving the security decision from the app to the server provides several strategic advantages:
- Prevents API Abuse: It ensures only genuine, untampered apps can talk to your server, effectively slamming the door on bots, scripts, and “non-genuine” apps.
- Instant Policy Updates: Normally, fixing a security hole requires a new App Store release. With attestation, you can update your security rules on the server instantly. This protects all users immediately without them needing to download an update.
- Strategic Deception: Instead of instantly blocking a hacker (which tips them off), you can use “Strategic Delay.” Slowing down their requests frustrates bots without letting the attacker know exactly how they were caught.
- Continuous Threat Detection: Managed attestation services stay updated on the latest hacking techniques (like new rooting or hooking methods). Your app stays protected against new threats without your developers having to write a single line of new security code.
The Bottom Line
True mobile security is about creating an unbroken chain of trust. By combining RASP (client-side protection) with App Attestation (server-side validation), you ensure that your “front door” is locked and that every person knocking is exactly who they claim to be.
Head on over to the Guardsquare blog to read the full article on “Bridging the Trust Gap: A Unified Strategy for Mobile API Security“.
