Practical content
APCosta Lab
Ready-to-use snippets, step-by-step tutorials and technical references for payment systems, mobile security and critical architecture.
TutorialAndroid12 min
Frida on Android: Dynamic Instrumentation, Bypass and APK Repackaging
How to use Frida for dynamic instrumentation on Android apps — method hooking, SSL Pinning bypass, root check bypass and APK repackaging with APKTool.
May 26, 2026Open
TutorialAndroid10 min
Static APK Analysis with JADX and Ghidra
How to use JADX for Java/Kotlin decompilation and Ghidra for native library (.so) analysis in Android apps — complete static analysis workflow for pentesting.
May 26, 2026Open
TutorialArchitecture8 min
Circuit Breaker in Practice with Resilience4j
How to implement a Circuit Breaker in Java with Resilience4j to isolate failures from external dependencies.
May 21, 2026Open
ReferênciaPayments6 min
Reference: TPS Calculation for Payment Systems
Formulas, benchmarks, and recommendations for sizing payment systems by TPS.
May 20, 2026Open
SnippetAndroid5 min
Snippet: Detecting SSL Pinning Bypass on Android
How to detect at runtime whether SSL Pinning is being bypassed by proxies or tools such as Frida.
May 19, 2026Open