A89: Re: How TI's keys work
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A89: Re: How TI's keys work
So are you saying that in genereal, TI won't sign apps if you wrote them
using the free SDK? Are they crazy? Do they want to stop us from making
games altogether?
Bryan
----- Original Message -----
From: "Scott Noveck" <noveck@pluto.njcc.com>
To: <assembly-89@lists.ticalc.org>
Sent: Thursday, December 02, 1999 4:14 PM
Subject: A89: How TI's keys work
>
> Judging by the 83+ SDK beta, you guys are all waaaaay off.
>
> First of all, the way app signing works is different from what you've
> described. The application itself is just modified to tell the calc that
it
> requires some "certificate(s)" to run. The certificates are what has to
be
> generated specifically for each serial number, and THESE are heavily
> encrypted. And I doubt you'll get anything at all out of that.
>
> Second, TI does NOT just sign any app you send them. Normally, they'll
only
> do it for those who BUY the SDK - for all other purposes, the free SDK is
> just a listing of ROM addresses. The 83+ apps out now - like calcsys -
were
> signed because TI has given us SDK beta testers the opportunity to get an
> app signed for our work -- actually a fair decision on their part.
>
> Also, the serial number on any HW1 calc can be changed. The whole reason
> HW2 was released is to fix the security bug allowing ROM modification on
old
> calcs. FYI, it's the same bug Archive Utility uses, and although no one's
> tried yet the address is known (I've seen it somewhere) and it COULD
> theoretically be done.
>
> -Scott
>
>
>
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