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Re: [81attendees] What is it at the bottom of restaurant receipts?

Richard Barnes <richard.barnes@gmail.com> Tue, 09 August 2011 19:53 UTC

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Date: Tue, 09 Aug 2011 15:53:49 -0400
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From: Richard Barnes <richard.barnes@gmail.com>
To: "Worley, Dale R (Dale)" <dworley@avaya.com>
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Subject: Re: [81attendees] What is it at the bottom of restaurant receipts?
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Anyone got one of these machines that we could take apart to try to
get at the key?  Just to verify our findings, of course. <evil grin>



On Tue, Aug 9, 2011 at 3:47 PM, Worley, Dale R (Dale) <dworley@avaya.com> wrote:
> ________________________________________
> From: 81attendees-bounces@ietf.org [81attendees-bounces@ietf.org] On Behalf Of Richard Barnes [richard.barnes@gmail.com]
>
> But then again, you wouldn't expect that if the hash
> were an HMAC instead of just a digest; it would make a lot of sense
> for the machine to compute the HMAC with a secret key that the tax
> department knows.
> _______________________________________________
>
> I believe I read on some explanatory page that the SRM-generated
> data was "digitally signed", which would suggest an HMAC generated
> with a secret key.
>
> Dale
>

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