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Date: Fri, 20 Nov 2020 22:01:38 +0900
From: SQP Admin <>
Subject: Session management on AMI - Interrupting and resuming


We are currently running an Openwall Amazon AMI, running an incremental 
session on a ZIP archive. We have chosen to go with a c5.24xlarge 
infrastructure and using multiple CPU threads like so:

john —session=XX —incremental=Alnum —fork=96 xxxx.hash

We are in a situation where we expect getting a correct guess will take 
some time and also have budget restrictions. We understand sessions can 
be interrupted and resumed using the —restore=[sessionname] option. Here 
are my questions:

1. Is the approach we’ve taken to take advantage of the 96 CPUs correct? 
(—fork=96) - or is there a better way of leveraging that instance 

2. We had to logout from our ssh session a couple of times and don’t 
know how to reconnect to our John session. We understand using 
—status=[sessionname] prints a status of the relevant session, however 
is there a way to reconnect to the session as when it was launched the 
first time and when pressing any key would display the status?

3. As we are not connected to the John session anymore, we are unable to 
figure out how to interrupt it gracefully, as we would usually do using 
“q” when connected to a live session. Could you please advise on how to 
interrupt sessions after reconnecting to the instance’s ssh?

4. We are on monthly budget and are looking into the possibility of 
running our crack like so:
- when budget is reached, interrupt the session, save .rec files locally 
and terminate the instance.
- when a new budget is approved, launch a new similar instance, move 
back the .rec files to that instance and use the —restore command to 
resume it.

Is this approach correct? If this works, we would need to understand how 
to interrupt a background session, as described in 3. Could you please 

Thank you very much for your time and support.

- Mike

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