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Date: Fri, 17 Oct 2014 23:40:42 +0200
From: Frank Dittrich <>
Subject: Re: Some format ssh and ssh-ng issues/questions

On 10/17/2014 10:21 PM, Dhiru Kholia wrote:
> On Fri, 17 Oct 2014, Frank Dittrich wrote:
>> According to doc/README.ssh, both formats (ssh and ssh-ng) support
>> cracking passwords of ssh private key files.
>> But for some reason, their corresponding converters, ssh2john and
>>, produce different hashes.
> See "../run/" utility.

OK, can convert ssh hashes into ssh-ng hashes.
Why didn't you update doc/README.ssh after you wrote

>> Apparently, ssh-ng needs additional 20 seconds before the real cracking
>> starts, because the status line reports just 10 seconds of run time.
>> So, you'd need some longer sessions, before ssh-ng with the reported c/s
>> rate of 4421K catches up with ssh (reported c/s rate 3051K).
>> Apparently, cipher 2 has been added (just to ssh-ng) with this commit:
>> commit da8f1dfcc35e41c52ff28428e9ffd6f65e34eafd
>> How to I generate such a private key?

When you rewrite ssh-ng at some point, you should mention that URL in a
OpenSSH version 6,5 includes support for Ed25519 as a public key type
and a new private key format that uses a bcrypt KDF.
What OS/distro currently ships OpenSSH version 6,5?


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