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PICList Thread
'PIC16C54A code protection'
1998\07\20@125909 by Lee Hewitt

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Hello all,
              If I try to read the code out of a code-protected PIC16C54A will I
corrupt the program code held in the device? only the programmer displays the
message ÎDevice is code protected, program may be invalidâ or something to
that effect.  Also when a PIC has been code protected, is that it in the sense
that the code is well and truly read protected or can the code be read out
some how?.  Only I have heard that certain PICâs (the PIC16C84 I think!) can
be Îcode bustedâ.

Many thanks for any help and advice.

     Lee Hewitt.



===================================================
Lee Hewitt
Manchester ENGLAND

Home      E-Mail:  spam_OUTLHewitt104TakeThisOuTspamaol.com
University E-Mail:  .....L.HewittKILLspamspam@spam@eee.salford.ac.uk
===================================================


1998\07\20@133210 by wwl

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On Mon, 20 Jul 1998 12:58:10 EDT, you wrote:

>Hello all,
>              If I try to read the code out of a code-protected PIC16C54A will I
>corrupt the program code held in the device? only the programmer displays the
>message ÎDevice is code protected, program may be invalidâ or something to
>that effect.
It means the data you just tried to read out will be invalid. The
device will not be affected.
> Also when a PIC has been code protected, is that it in the sense
>that the code is well and truly read protected or can the code be read out
>some how?.  Only I have heard that certain PICâs (the PIC16C84 I think!) can
>be Îcode bustedâ.
Any protection can be broken with enough time and resource. Apart from
the notorious 16C84 hole, I wouldn't lose too much sleep over PIC code
security.
    ____                                                           ____
  _/ L_/  Mike Harrison / White Wing Logic / wwlspamKILLspamnetcomuk.co.uk  _/ L_/
_/ W_/  Hardware & Software design / PCB Design / Consultancy  _/ W_/
/_W_/  Industrial / Computer Peripherals / Hazardous Area      /_W_/

1998\07\21@062127 by Caisson

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face
> Van: Lee Hewitt <.....LHewitt104KILLspamspam.....AOL.COM>
> Aan: EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU
> Onderwerp: PIC16C54A code protection
> Datum: maandag 20 juli 1998 18:58
>
> Hello all,
>              If I try to read the code out of a code-protected PIC16C54A will
I
> corrupt the program code held in the device? only the programmer displays
the
> message ÎDevice is code protected, program may be invalidâ or something
to
> that effect.

The message displayed when you are reading the PIC's contents refer to the
code on your screen, not in the PIC.  The code in the PIC is OK, but when
you try to read it it will be garbeled, hence the message 'program _is_
invalid'.

>  Also when a PIC has been code protected, is that it in the sense
> that the code is well and truly read protected or can the code be read
out
> some how?.  Only I have heard that certain PICâs (the PIC16C84 I think!)
can
> be Îcode bustedâ.

The time and/or mony spend to 'crack' any protection is about the time
and/or mony spend to protect it squared.  In short : Any protection can be
defeated, but the question is if you will live that long and do you have
got a big enough wallet.

The PIC16x84 is an EEPROM-device. the Code-protect can be reset - together
with the code-memory.  It is not especially suseptible to code-protect
attacks (afaik).

> Many thanks for any help and advice.
>
>       Lee Hewitt.

Greetz,
 Rudy Wieser

1998\07\21@154647 by Rob

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face
On Tue, 21 Jul 1998, Caisson wrote:

> > Van: Lee Hewitt <LHewitt104spamspam_OUTAOL.COM>
> >  Also when a PIC has been code protected, is that it in the sense
> > that the code is well and truly read protected or can the code be read
> out
> > some how?.  Only I have heard that certain PIC’s (the PIC16C84 I think!)
> can
> > be ‘code busted’.
>
> The time and/or mony spend to 'crack' any protection is about the time
> and/or mony spend to protect it squared.  In short : Any protection can be
> defeated, but the question is if you will live that long and do you have
> got a big enough wallet.

I think the more relevant issue is how easily can you find someone that
knows how to crack a pic.  Then, how much will it cost you for his
services.

Rob

1998\07\22@064556 by Caisson

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face
> Van: Rob <@spam@robzsKILLspamspamHICOM.NET>
> Aan: KILLspamPICLISTKILLspamspamMITVMA.MIT.EDU
> Onderwerp: Re: PIC16C54A code protection
> Datum: dinsdag 21 juli 1998 21:45
>
> On Tue, 21 Jul 1998, Caisson wrote:

[Cut]

> > The time and/or mony spend to 'crack' any protection is about the time
> > and/or mony spend to protect it squared.  In short : Any protection can
be
> > defeated, but the question is if you will live that long and do you
have
> > got a big enough wallet.
>
> I think the more relevant issue is how easily can you find someone that
> knows how to crack a pic.  Then, how much will it cost you for his
> services.

Your'e talking about 'second level' crackers.  The statement is ment for
the actual hacker of the code.  His time and his mony are involved.  If he
can find someone to pay him for his hobby <g> he thinks commercially too
..

Greetz,
 Rudy Wieser


'PIC16C54A code protection'
1998\08\17@122712 by marc
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Hi Caisson (Caisson), in <RemoveME199807221043.MAA12255TakeThisOuTspamdegas.telebyte.nl> on Jul 22 you
wrote:

> Your'e talking about 'second level' crackers.  The statement is ment for
> the actual hacker of the code.
            ^^^^^

;-) If you pay me, I'll "hack" a new software together.  You'll stay legal,
and even receive documented source - wow!

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