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Posts by Samuel Hopstock - Software Engineer

You Shipped the Fix, but Your Old App Is Still Out There, Now What?

11 minute read | September 8, 2026

Here’s a security incident scenario. You ship a mobile app with insufficient tampering protection, and someone finds it. Now the app can be modified and repackaged into a malicious version with almost no effort.

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    Samuel Hopstock - Software Engineer

    3 min read | December 10, 2024

    Improve Your Mobile App Security in Less Than 5 Minutes

    Android iOS Technical AppSweep
    5 min read | November 15, 2022

    Call Graphs: The Bread and Butter of Program Analysis

    Android Technical Dexguard ProGuard & R8
    10 min read | May 10, 2022

    Who You Gonna Call? Behind the Scenes of JVM Method Invocations

    Android Technical Dexguard ProGuard & R8
    10 min read | January 18, 2022

    How to Securely Implement TLS Certificate Checking in Android Apps

    Android Technical Protection Dexguard
    8 min read | December 21, 2021

    Insecure TLS Certificate Checking in Android Apps

    Android Technical Protection Dexguard
    When Restricted Doesn’t Mean Secure: Google API Keys in Mobile Apps https://www.guardsquare.com/blog/google-api-key-restirctions-mobile-app-security
    Improve Your Mobile App Security in Less Than 5 Minutes https://www.guardsquare.com/blog/improve-mobile-app-security
    Call Graphs: The Bread and Butter of Program Analysis https://www.guardsquare.com/blog/call-graphs-the-bread-and-butter-of-program-analysis
    Who You Gonna Call? Behind the Scenes of JVM Method Invocations https://www.guardsquare.com/blog/behind-the-scenes-of-jvm-method-invocations
    How to Securely Implement TLS Certificate Checking in Android Apps https://www.guardsquare.com/blog/how-to-securely-implement-tls-certificate-checking-in-android-apps
    Insecure TLS Certificate Checking in Android Apps https://www.guardsquare.com/blog/insecure-tls-certificate-checking-in-android-apps