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PICList Thread
'[PIC]: safe safe'
2001\11\03@072100 by Francois Robbertze

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One of my first projects was to make a "safe" safe.

I have two pic16f84a inside a safe, the first pic scans the keypad and
controls passwords on the safe and send a code to the second pic that checks
the safe's "attack" status and drives a servo, led's and a buzzer.

Are there a "safe" way to unprotect code on a 16f84a. If there are please
let me know...I have access to the first pic's serial programming pins(GND,
Vcc, Mclr, RB6, RB7) and the other pins that is connected to the keypad.

The owner of the safe lost his user and master pin and I have long ago
discard the hard coded master pin...

To override the first pic with a new program will also not work, because I
also do not have the hard coded pin on the second pic.

If I can get around the protection bit, I would be able to read the
information on the pic to open the safe again.

Regards

Francois
spam_OUTfr10TakeThisOuTspammweb.co.za

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2001\11\03@170706 by Olin Lathrop

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> One of my first projects was to make a "safe" safe.
>
> I have two pic16f84a inside a safe, the first pic scans the keypad and
> controls passwords on the safe and send a code to the second pic that
checks
> the safe's "attack" status and drives a servo, led's and a buzzer.
>
> Are there a "safe" way to unprotect code on a 16f84a. If there are please
> let me know...I have access to the first pic's serial programming
pins(GND,
{Quote hidden}

It makes no sense to persue this.  Succeeding would only prove that you did
a poor job the first time around.  How is anyone supposed to trust you in
the future if you show them how you could have cracked your own safe all
along?


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, .....olinKILLspamspam@spam@embedinc.com, http://www.embedinc.com

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2001\11\03@185232 by James Caska

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>It makes no sense to persue this.  Succeeding would only prove that you did
>a poor job the first time around.  How is anyone supposed to trust you in
>the future if you show them how you could have cracked your own safe all
>along?

But hey.. if you can't pick your own lock perhaps you really do have a
future in the biz :-)

Regards,
James Caska
caskaspamKILLspamvirtualbreadboard.com, http://www.virtualbreadboard.com
ujVM - 'The worlds smallest java virtual machine'


{Original Message removed}

2001\11\03@210204 by M. Adam Davis

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What is the penalty for a wrong code entered?  If there is no penalty,
use another pic to interface with the keypad to try all combinations.

-Adam

Francois Robbertze wrote:

{Quote hidden}

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2001\11\04@073034 by Francois Robbertze
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After three wrong user pins inputs, you need the master key to "override'
the user pin...The master key have about 30 seconds delay time between each
incorrect try...Thus I need about 3 years!

{Original Message removed}

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