rev writeups

find rev ctf writeups.

reversing writeups trace how someone understood an unknown binary — decompiling the validation logic, defeating anti-debug, or reversing a custom VM — to find the input that prints the flag.

search rev writeups on ctftime

ctftime: rev ctftime: crackme ctftime: reversing

what rev writeups cover

crackme / license checkwriteups locate the comparison in decompiled code and patch the jump or extract the key.
anti-debugwriteups bypass ptrace/timing/IsDebuggerPresent checks by patching or with ScyllaHide.
packed binarywriteups unpack UPX or dump self-decrypted code from memory in GDB.
custom VMwriteups reverse the opcode handler, then disassemble the embedded bytecode.
symbolic executionwriteups drive angr to the success branch instead of reversing complex logic by hand.
Android / bytecodewriteups decompile APKs with jadx and find validation in the activity or native lib.

read writeups after you've tried

writeups teach the most when you've already spent real time on a revchallenge. if you're stuck mid-solve, get a spoiler-free hint first — then read a writeup to see the gap between your approach and the intended one.

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