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Jez Smith
07/14/12 19:57
Modified:
  07/14/12 20:00

Read: 529 times
Birmingham
England


 
#187940 - The eeprom doesnt hold the password
Responding to: ???'s previous message
It holds a hash of the password, that way if someone reads the eeprom they cannot find out the password.
So your system has to do a hash of the password entered by the user and compare it to the password hash stored in the eeprom.

possible hashes are SHA or MD4
also increasing the password length by one bit doubles the password search space, and you should limit the number of attempts you can make in one session.

List of 13 messages in thread
TopicAuthorDate
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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