Cracking gpg key passwords using john the ripper

John the Ripper is a không tính phí & Open Sourcepassword cracker. Its primary purpose is to detect weak Unix passwords and It is one of the most popular password testing and breaking programs. It combines a number of password crackers inlớn one package, autodetects password hash types, & includes a customizable cracker.JTR is available in official Ubuntu repositories.

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I forgot my GPG key passphrase recentlyand I was having a tough timeremembering it.Thanks toJTR I was able lớn recover it again.
For recovering the GPG key passphrase, I used a custom JTR build by magnumripper
. It includes a nice gpg2john binary that converts your key file inkhổng lồ a format that JTR understands.
JTR uses many types of attachồng including single craông chồng mode, dictionary & incremental brute force. In dictionary mode, you have khổng lồ supply a text tệp tin containing allpossiblepasswords and JTR checks all of them against the hash.
If you remember some parts of your password, then you can usedictionarymode which is the fasthử nghiệm way lớn craông xã password. If you think your password danh sách is not enough then you can customize JTR"s mặc định dictionary mode using rules khổng lồ suit your needs.

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If you rethành viên nothing at all then you have sầu lớn use incremental brute force method which can take days khổng lồ crackdependingon type of hash, strength of your password,customizationvà a number of other factors.
Thankfully for me, dictionary mode was enough to lớn recover the passphrase. I supplied a danh mục of around 100 passwords which I obtained by usingpermutation method from Pyhạn hẹp itertools. Below is the entire process I followed & John took less than a second khổng lồ craông chồng the passphrase. Hopefully it will be useful for someone.
Extract the source code archive sầu & from src folder run make comm&. It will give you all possible build options. I used linux-x86-any khổng lồ compile JTR. So the full comm& to run now: make linux-x86-any.
Once the process has finished, compile gpg2john by runningmake gpg2john. Go the run folder to lớn find compiledbinariesfor JTR.
If all went well, your password will be displayed in terminal. It will be added to john.pot tệp tin in run folder as well. You can also display your password by running command: john --show hash.


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