Password in EEPROM

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???
07/13/12 17:29
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#187927 - Password in EEPROM

Hi,
I am designing electronic lock for small safe. I got sample of one safe and it uses 89C51 and EEPROM 93C46, this is used for storing a four digit password.
I keyed in four digit password then I removed the 93C46 which contains password and replaced it with blank one, after switching on the system it was giving error signal, it means apart from password it also stores some data so it can recognized EEPROM.
Now I am designing the lock system using PIC16F886 and with changes in control logic and latest components. Since this PIC has inbuilt 256B of EEPROM. I want to know what prosecution required for this?
Please tell me logic to make safe more secure and easy. Suggestion required.

List of 13 messages in thread

Topic Author Date
Password in EEPROM       Arif Deshmukh       07/13/12 17:29
   Checksum       Per Westermark       07/13/12 21:29
      8-digit code       Per Westermark       07/13/12 21:36
         Master Code       Arif Deshmukh       07/13/12 22:35
            So what does the requirements spec say?       Per Westermark       07/13/12 22:47
            master codes ....       Erik Malund       07/14/12 01:12
               This is a low-security lock - or no measly 4-digit PIN       Per Westermark       07/14/12 01:18
                  language       Erik Malund       07/14/12 08:48
                     just a thought       Erik Malund       07/14/12 09:09
                        Never give access when locked       Per Westermark       07/14/12 10:14
                     PIN + PUK       Per Westermark       07/14/12 10:11
   The eeprom doesnt hold the password       Jez Smith       07/14/12 19:57
      High/low security         Per Westermark       07/14/12 23:10

Back to Subject List

Topic	Author	Date
*Password in EEPROM*	Arif Deshmukh	07/13/12 17:29
Checksum	Per Westermark	07/13/12 21:29
8-digit code	Per Westermark	07/13/12 21:36
Master Code	Arif Deshmukh	07/13/12 22:35
So what does the requirements spec say?	Per Westermark	07/13/12 22:47
master codes ....	Erik Malund	07/14/12 01:12
This is a low-security lock - or no measly 4-digit PIN	Per Westermark	07/14/12 01:18
language	Erik Malund	07/14/12 08:48
just a thought	Erik Malund	07/14/12 09:09
Never give access when locked	Per Westermark	07/14/12 10:14
PIN + PUK	Per Westermark	07/14/12 10:11
The eeprom doesnt hold the password	Jez Smith	07/14/12 19:57
High/low security	Per Westermark	07/14/12 23:10