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Posts by Samuel Hopstock - Software Engineer

From Keep Rules to Guided Configuration

11 minute read | April 7, 2026

Applying an optimizer like ProGuard or R8 can significantly improve the size or performance of your application. However, using such tools requires adding configuration in the form of keep rules to ensure your app stays functional after the...

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    About 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