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#1 2009-10-16 22:48:19
- elektryk
- Contributor
- Registered: 2009-09-10
- Posts: 43
Successful login on key B with readable key B
According mifare documentation, if trailer is configured with key B readable any autentication to this sector with key B will not work. I made trailer KeyA: 010101010101 and KeyB: FFFFFFFFFFFFF
block value: 010101010101FF078069FFFFFFFFFFFFF to trailer sector and after readback I get: 000000000000FF078069FFFFFFFFFFFFF (key A is masked, key B is readable). I can read whole sector with autentication on key A (01.....01) OR on key B (FF...FF). I think this is against specification, but I may be wrong. If it is not, maybe my cards are fake/counterfeit?
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#2 2009-10-17 12:03:11
- rule
- Member
- Registered: 2008-05-21
- Posts: 417
Re: Successful login on key B with readable key B
From the datasheet 
[1] if Key B may be read in the corresponding Sector Trailer it cannot serve for authentication (all grey marked
lines in previous table). Consequences: If the reader tries to authenticate any block of a sector with key B
using grey marked access conditions, the card will refuse any subsequent memory access after
authentication.
authenticate - yes
read/write - no
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#3 2009-10-17 20:38:15
- elektryk
- Contributor
- Registered: 2009-09-10
- Posts: 43
Re: Successful login on key B with readable key B
authenticate - yes
read/write - no
It is not still not clear for me. In my card, if I log into card (with sector trailer as described above) using key B and I can read sector (any block) (after authentication with key B) it is my misunderstood (I think it should fail) or something wrong with my card?
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#4 2010-12-27 11:13:46
- fang
- Member
- Registered: 2010-12-22
- Posts: 3
Re: Successful login on key B with readable key B
I met alomost same case as elekryk did .Now i'm sure that this might be a fake card with Fudan chip FM11RF08 which has following feature:
Key A Access bits Key B
C13 C23 C33 Read Write Read Write Read Write
0 0 0 Never KeyA|B KeyA|B Never KeyA|B KeyA|B
0 1 0 Never Never KeyA|B Never KeyA|B Never
1 0 0 Never KeyB KeyA|B Never Never KeyB
1 1 0 Never Never KeyA|B Never Never Never
0 0 1 Never KeyA|B KeyA|B KeyA|B KeyA|B KeyA|B
0 1 1 Never KeyB KeyA|B KeyB Never KeyB
1 0 1 Never Never KeyA|B KeyB Never Never
1 1 1 Never Never KeyA|B Never Never Never
or from some manufectures like Fudan
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