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Reversing for beginners 2
Simple keygen with radare2
Sven Steinbauer (@binaryheadache)
Recap
Cast your mind back to previous talk
registers
mov command
conditional jumps
basic math (add, sub)
the stack
Today we'll apply that
1. Quick overview of our tool: radare2
2. Analyse the binary
3. Reverse the keygen algorithm
4. Write a keygen ourselves
radare2
h ps://radare.org
RAw DAta REcovery
11 years old
Reversing framework
Debugger
Assembler & disassembler
Scriptable
and much more
we'll barely scratch the surface
Our binary
An ordinary keygenme
from crackmes.de level 2
http://ow.ly/sMxj30aypvK
linux x86 32bit
compiled with nasm
no external libs
very simple
Demo  me
wish me luck
1. Ini al recon
2. Sta c analysis
3. Algorithm summary
4. Write keygen
5. Profit
[summary]
Ques ons?
sven@unlogic.co.uk
@binaryheadache

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