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#1 2014-10-05 08:31:40
- Sentinel
- Contributor
- Registered: 2012-11-26
- Posts: 190
Card for Siemens access control system
my friend has 2 cards for access control system Siemens.
Its a conventional 64-bit card.
but the code is printed on the cards somehow encrypted.
I have not been able to understand exactly how.
Maybe some one knows?
0F00CD7CF1 => 0011000653 (printed)
0F00CD9C42 => 0010969444 (printed)
#2 2014-10-05 19:38:31
Re: Card for Siemens access control system
In my very humble opinion the decimal value, converted in binary, is obtained taking specific bits of the hex value converted in bin; in practice there is a bit scrambling only, no encryption. I think I will be able to identify a correlation if I have 2 more examples, for now I seem to have located 8 bits only.
#3 2014-10-06 05:24:52
- marshmellow
- Contributor
- From: US
- Registered: 2013-06-10
- Posts: 2,302
Re: Card for Siemens access control system
I've seen this. I believe it to be just as asper said.. Pattern goes like this: convert hex ID to binary:
bit 18,20,17,19,23,21,24,22,26,28,25,27,35,37,40,34,31,29,39,38,36,30,32,33 no 0 bit in count, count from left(msb). (Make sure to pad leading zeros.)
Convert binary to decimal.
You said this is for a Siemens? Do you know the reader/models?
Last edited by marshmellow (2014-10-06 05:37:06)
#5 2014-10-06 14:10:55
- marshmellow
- Contributor
- From: US
- Registered: 2013-06-10
- Posts: 2,302
Re: Card for Siemens access control system
As I mentioned, I've seen these tags before. 
#6 2014-10-06 14:15:46
- marshmellow
- Contributor
- From: US
- Registered: 2013-06-10
- Posts: 2,302
Re: Card for Siemens access control system
I Just don't know the system they were used for
#8 2014-10-06 15:51:06
- marshmellow
- Contributor
- From: US
- Registered: 2013-06-10
- Posts: 2,302
Re: Card for Siemens access control system
actually you've seen this format before as well asper.. it is already included in the [EM4100-Unique blocks calculator.xlsm], you made (or helped make?)...
#9 2014-10-06 15:55:26
- marshmellow
- Contributor
- From: US
- Registered: 2013-06-10
- Posts: 2,302
