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Date: Wed, 12 Aug 2020 06:54:55 +0200
From: Johny Krekan <>
Subject: Re: Performance of 5 days demo of the cloud which was
 mentioned in the message with subject John in the cloud

Hello, Those details are important for me:-)
You mentione the speed s in c/s . C/s means password/sec?
What do you think could be speed of one p3.2xlarge instance? (wpa 
password /sec) What would be a price of one such instance for example 
for one day?
Thanx for info
Johny Krekan

Dňa 11. 8. 2020 o 16:58 Solar Designer napísal(a):
> Hi Johny,
> Performance varies between AWS instance types a lot.  On the new "John
> the Ripper in the cloud" homepage there's a screenshot (now with ALT tag
> giving more detail) showing a p3.2xlarge instance's NVIDIA Tesla V100
> GPU achieve ~27M c/s at md5crypt-opencl for "Many salts".  That's a very
> good speed, but this instance currently costs $3.06/hour on-demand or
> $0.918+/hour spot, plus $0.64/hour for our Bundle (beyond our 5-day free
> trial).  You appear to be asking about cheaper/free instances, so for
> comparison a t2.nano (the smallest instance they have) achieves ~70k
> short-term at md5crypt for $0.006/hour and a t2.micro achieves the same
> (but has more RAM) for $0.012/hour on-demand or currently $0.0035+/hour
> spot.  These tiny instances are also free for the first year for new AWS
> users, and we don't charge for usage of our Bundle on those.
> So by using these tiny instances, you could get something like 0.26% of
> the performance of our recommended instance type, but it's free or
> cheap, and in absolute terms (not relative to a high-end GPU) the speed
> might just be sufficient for some focused attacks or detection of the
> weakest passwords.  Those tiny instances would also fare relatively
> better for hash types that are GPU-unfriendly (e.g., bcrypt) or for
> which there's no GPU support yet.
> For WPA PSK in particular, I am getting 2200 to 2300 c/s short-term on
> either t2.nano or t2.micro.
> But there's a catch:
> Performance on these tiny instances might become lower with long-term
> 100% CPU load unless a paid option called "T2/T3 Unlimited" is enabled.
> Without that option, t2.nano's performance reduces to 5% and t2.micro's
> to 10% of original in my longer benchmark runs.  Specifically, I get
> only 214 c/s long-term at WPA PSK on t2.micro without "T2/T3 Unlimited".
> Some of my tests on t2.nano fail because its 0.5 GB RAM is too little,
> but many other tests work.  I recommend at least t2.micro with its 1 GB.
> You obviously need larger instances for serious usage, but these tiniest
> ones are suitable for some educational uses (such as learning how to run
> a password cracker on AWS at all).
> 5 days free trial applies to our software only, and only for larger
> instances (on these tiny ones, our software is free without a time
> limit).  If you're new to AWS and choose one of these tiniest instances,
> as I understand you can use it for free for the first year since your
> AWS account creation.  If you're no longer eligible (have an old AWS
> account) or use larger AWS instances, you need to pay for their usage
> (and there's no free trial for that).
> The prices I mentioned here are for instances in a US region and for an
> AWS account with a certain US billing address.  There might be sales tax
> or VAT added depending on choice of region and/or billing address.
> I hope this isn't too much detail for you.
> Alexander
> On Tue, Aug 11, 2020 at 02:42:50PM +0200, Johny Krekan wrote:
>>   Hello, I would like to ask what is the estimated performance of the
>> cloud (like passwords/second for example for WPA PSK hashes).
>> Five days means that one user who is testing this cloud will have some
>> hardware resources remotely at his disposal for 120 hours?
>> Thanx for info
>> Johny Krekan

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