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Posts by Samuel Hopstock - Software Engineer

Protect and Safeguard API Keys from Leakage and Misuse

17 minute read | August 12, 2025

A skeleton key is an interesting concept. The ability to unlock all the rooms of a house with one simple tool is incredibly useful when in the right hands - the homeowner, for instance. But when locked in a mischievous grasp, this tool quickly...

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    About Samuel Hopstock - Software Engineer

    13 min read | November 15, 2022

    Call Graphs: The Bread and Butter of Program Analysis

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

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

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

    How to Securely Implement TLS Certificate Checking in Android Apps

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

    Insecure TLS Certificate Checking in Android Apps

    Android Technical Protection Dexguard
    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