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Date: Mon, 6 Aug 2012 22:13:26 +0530
From: Dhiru Kholia <>
Subject: Cracking PuTTY private keys with JtR


I have added support for cracking PuTTY password protected private
keys to JtR. My code is based on by michu.


1. Compile ppk2john.c (run "gcc ppk2john.c -o ppk2john" in src folder)
2. Run ppk2john on PuTTY private key files.
3. Run john on the output of ppk2john.


$ ../run/john -fo:ppk -t # AMD X3 720 BE CPU
Benchmarking: PuTTY Private Key SHA-1 / AES [32/64]... (3xOMP) DONE
Raw:	409920 c/s real, 138020 c/s virtual

Real cracking is slower than the benchmark (around 73,000 c/s per
core). Standalone cracker (for debugging, no longer recommended for
real use) can be obtained from GPG secret keys are next on
my list.


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