Ssh2john

I tried to decrypt an SSH key, but didn't find ssh2john in Kali Linux. I had downloaded the latest version of Kali and John the Ripper is already pre-installed in it. I used the locate *2john command and can find other John tools, but not ssh2john. Why is this so? If I can't use ssh2john, are there any other tools or methods to replace it to crack the SSH key?

After research, I found that ssh2john not in JTR/src, it's in run:ssh2john.py. So I copy the py file to OS,then use python ssh2john.py id_rsa>idcrack to run. It succeed.Then you can use john idcrack to crack the private key.

Ssh2john

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John has plenty of modules that can be used for performing dictionary or brute force attacks for different targets. One of the modules that will be covered in this post is called ssh2john.

It depends on the engagement rules. But once again, gaining access to a private SSH key is a critical security issue in itself. Reporting this finding to the client is enough. But if you do have the time for going deeper, you might want to use ssh2john for cracking the SSH key. Maybe you will log in to the system with this private key and will find there other vulnerabilities. Who knows.

NotesUploaded files will be deleted immediately. We do NOT store your files.This site is using ssh2john from JohnTheRipper to extract and display the hash of the password that protects the private key file, which hashcat/john can then crack.Sample files to test the service can be dowloaded here or here.How to use?More than easy, just select and upload your Private Key SSH file. The hash will be computed in the "Output" part.

We support: OPENSSH: private key format for OpenSSH (ed25519 signatures), bcrypt PBKDF + AES-256-CBCAES-128-CBCAES-256-CBC AES-256-CTRAES-192-CBC DES-EDE3-CBC DSAEC

In this step, we will use the john the ripper tool to crack the passphrase of the key file. John the Ripper is one of the best tools for cracking the password, and it is by default configured in Kali Linux. The process of cracking the password of the SSH key is different. First, we must extract the hash from the key, which can be done by using another utility named ssh2john, also part of the John the Ripper tool. The command and the output can be seen in the following screenshot: 17dc91bb1f