KCTF Android JNI Mixed Flow
SkillWeb & browsingGuides your agent through solving Android crackme challenges that split validation logic between Java code and native libraries.
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Add ahel to your AI once: Claude, ChatGPT, Cursor, Claude Code or Codex. Then ask it to use this.
Then ask your AI: use the KCTF Android JNI Mixed Flow skill
About this skill
Solve KCTF Android APKs with JNI bridges, native .so logic, channel splits, and mixed Java/native state machines. Use when the artifact includes classes.dex, lib/*.so, and the check is split across Java input, JNI dispatch, and native code.
What this skill tells your AI
The instructions your AI receives, as published by manyuegong33/r0crawl_skills in skills/kctf-android-jni-mixed-flow/SKILL.md and read by ahel’s review.
Workflow
- Identify package, activity, JNI exports, and the native library path.
- Separate Java-side validation from native-side validation.
- Trace the full path:
- Java input
- JNI entry
- native state transforms
- final success string
- Check for channel splits, hex/byte conversion, or fixed-size buffers before solving.
- Verify on the original APK or extracted sample, not on decompiled pseudocode alone.
Use this pattern
classes.dex+lib/*.soJava_com_*JNI exports- even/odd or split-channel transforms
- native anti-debug / state-machine / crypto logic
Reference
references/pattern.md
Signals
- GitHub stars
- 285
- Forks
- 100
- Last commit
- Sep 2026
Advanced
- Catalog kind
- skill
- Key
kctf-android-jni-mixed-flow- Source
- github.com/manyuegong33/r0crawl_skills