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Per Westermark
07/14/12 10:11
Read: 503 times

#187938 - PIN + PUK
Responding to: Erik Malund's previous message
It's basically the PIN code for end-user and PUK code for the fool who changed and forgot.

The PIN code for memory, and the PUK code for safe storage somewhere else.

But the term master code is actually used even when being different for every installation. Think about a lock for many employees. They all have their individual PIN. But the system also have a master code, which is used for gaining access and add/remove the individual PIN codes.

Having a master code formed mathematically from a serial number is doable. But the bad thing is that you don't want someone to figure out (or steal) that formula. A factory that sends out 1000 locks should basically create 1000 totally random master codes, so there are no way to take the knowledge of 10 locks and apply to the eleventh.

List of 13 messages in thread
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      

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