What you will probably find that they are using is a proximity Access Control system. The cards / fobs for these can either be the size of a busness card, or a small fob that you can attach to a key ring. The Bldg mgmt is correct. These Cards (this refers to either a card or a fob) actually have a 16digit id number, and are programmed to transmit a designated number of bites to the reader / Access control unit.and usually have the data on the card encrypted somehow.
Duplication of these cards is possible, but EXTREMLY expensive. You not only have to duplicate the card, but the entire 16 digit id number, but the encryption as well
If you would like more information, please feel free to contact me off-list if you wish. I am a Journeyman Locksmith specializing in Electronic Security (Access Control and CCTV systems)
Darcy
Dave wrote:
note: this isn't directly linux related, but is technology and freedom
related.
Does anybody have any advice how to go about essentially duplicating one
of these proximity keytags or the signal it emits?
http://postech.ca/products/common/cards/crr704a.asp
my grandma's senior home (of all places) is being very tenant unfreindly,
and has switched from regular keys to these proximity keytags for perimeter building entrances, which itself makes it hard for a family member check up since they wont give extra keytags to family (thats why
building mgmt installed the proximity sensors in the first place, they say
there was too much key copying going on), but now they have also installed
a timer on the front door, which visitors *need* to enter in order to use
the buzzer system, and this timer will lock the door to all visitors after
11pm. I think my family is going to find out what they can do about this
through various channels, but I figured I would look into trying to find
out a way to solve our problems with technology.
Basically what I know about these keytags is that they likely use
'modulated backscatter'. Any and all advice is much appreciated.
Thanks,
Dave
