john -show hash_file Let’s see if you can crack some of my UNIX accounts baby:$6$rc7o1BLw$Qsl9hnQx7W3C3KDagDkWXAXDx0vDWqwM0BOOeQyotXzCvUs6DeijTp3zBsbjCw4ou2OoJXKf6qNC5pEGEsjZF/ Display the plain passwords (cracked hashes).Restore your previous job in background.Three other quick tips regarding John the Ripper That's because I requested OpenMP to use only one core on my dual-core CPU.įeel free to adjust the number of cores you want to use with OMP_NUM_THREADS. Only one salt: 3770K c/s real, 3770K c/s virtualĪs you can see, this bench is twice slower than the previous one. Many salts: 3982K c/s real, 3990K c/s virtual john -test Benchmarking: Traditional DES. Now let’s do something fun, if you want John to use a certain amount of cores you can adjust it with the environment variable OMP_NUM_THREADS:.

Only one salt: 6876K c/s real, 3487K c/s virtualĪt this stage, John should now use all your CPU cores. Many salts: 7651K c/s real, 3872K c/s virtual Some benches should appear… Benchmarking: Traditional DES. So, because I’m running Debian x86_64, I will choose linux-x86-64. This command will list all the systems where john can be compiled on. Locate the following lines: # gcc with OpenMPīefore compiling john, make sure you have gcc installed! Now, let’s compile john. Now let’s make some changes inside the Makefile to enable the use of OpenMP.When I write this article the latest stable release was 1.7.9. First go to, and download the latest version.Let’s try some simple steps to enable and illustrate the new feature One of the best platform on which you should use John the Ripper is UNIX, I personally prefer running john on Debian x86_64. Of course this feature was present on some patched versions of John, but since the 1.7.9 version it is officially integrated. But today, John the Ripper 1.7.9 supports OpenMP which brings Multi-Processing. John can break many password hashes, but one of the primary missing feature was the CPU multiple core support. John the Ripper is a fast and famous password cracker.

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