> Give them demo mode initially. Then when they
> run it display the unique ROM ID of their Palm and
> send them off to a webpage that calls a small
> encryption routine which encrypts these device
> ID with a key known only to you and produces a
> unique code that they must enter on their device.
>
> Built into your Palm app is a decrypt routine that
> works the encryption backwards (using the same
> key you used to encypt) - if the answer matches
> the Palm's unique ID its registered.
>
> This is not foolproof but it will beat most users.
wrong.. it wont beat anyone :)) the code is there.
it is possible to get a memory dump using a tool
like "debuffer" without actually having to patch
the PRC file :))
your best bet is to simply not have the code in the
demo version. you can put the "registered" code in
a seperate PDB file and dynamically load this data
chunk and treat it like a function.
to add *some* level of protection, you can encrypt
this data chunk using the hotsync id, or any other
'key' :)
but.. that wont stop them either.. they will just
get a working PDB file and user id (key) and then
bypass all your checking/decryption and distribute
the un-encrypted files :))
the "dreadling" application did this, and they
had a warez version available for download in a
matter of days (most of the wait was to get a
PDB file from an existing registered user).
unless you like playing around with 'hacks' and
'tricks' of low level m68k programming - dont bother
:)) [i enjoy it - and have played games with the
hackers for the last 5 months]
i have performed all the research i need for my
"cracking" paper - and i will outline the best way
you can protect your applications.. however, it
is not the best in regards to 'distribution' :))
if you are interested in the paper.. be sure to
send me a note to:
[EMAIL PROTECTED]
the goal is to get the paper accepted at palmsource
2000 :)
cheers.
az.
--
Aaron Ardiri
Java Certified Programmer http://www.hig.se/~ardiri/
University-College i G�vle mailto:[EMAIL PROTECTED]
SE 801 76 G�vle SWEDEN
Tel: +46 26 64 87 38 Fax: +46 26 64 87 88
Mob: +46 70 656 1143 A/H: +46 8 668 78 72
if you enjoy it, then it aint work :) - rule #106 of life
--
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