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Hi, I'm undergraduate student living in Korea.
Few days ago, I used hi14asnoop to Daejeon traffic card <-> Daejeon bus' reader and obtained some result.
Here is some part of it:
+ 0: : 26
+ 2984: : 26
+ 3480: : 26
+ 143700: : 26
+ 64: 0: TAG 04 00
+ 1704: : 93 20
+ 64: 0: TAG 3b 4c ca d6 6b
+ 2336: : 93 70 3b 4c ca d6 6b fc 64
+ 64: 0: TAG 08 b6 dd
+ 1320: : 50 00 57 cd
+ 5991: : 26
+ 3431: : 26
+ 3464: : 26
+ 27716: : 52
+ 64: 0: TAG 04 00
+ 1200: : 93 20
+ 64: 0: TAG 3b 4c ca d6 6b
+ 3022: : 93 70 3b 4c ca d6 6b fc 64
+ 64: 0: TAG 08 b6 dd
+ 2272: : 30 02 10 8b
+ 72: 0: TAG 04
+ 1376: : 52
+ 64: 0: TAG 04 00
+ 1736: : 93 70 3b 4c ca d6 6b fc 64
+ 64: 0: TAG 08 b6 dd
+ 5440: : 60 00 f5 7b
+ 112: 0: TAG 10 18 d6 ed
+ 1448: : da ff c0 a2 74 24 8f 45 !crc
+ 63: 0: TAG 0f! f3! 81! 13
+ 1408: : 01 ab d2 58 !crc
+ 72: 0: TAG a0! d2! 34 df 15! a7! 06! 4e! 15 3f! c7! d7 79! 91! 5d! 2b! 96 c4! !crc
+ 3768: : 2e d7 61 b6 !crc
+ 72: 0: TAG 0a! e5! 5a 79! 00! 73! f1 5d d5 02! df e4! 63! 17 fa! 59! 06 cd! !crc
+ 17597: : 52 The question is, what does 0f! f3! 81! or !crc mean?
What condition triggers this ! appear?
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! behind a byte value indicates parity bit failure
(in programming ! means "not")
every 8 bit are sent with a parity bit, if this parity bit is correct nothing is shown. if it isn't an exclamation mark is shown.
this is a lot more compact and easier to read than if there were more 0s and 1s printed.
-q: why are there so many failures?
-a: the parity bit is encrypted too, so when looking at it before decryption the parity bits appear to have failed.
-q: why print it at all.
-a mifare classic leaks information in the parity bit, read the docs on how
-q: anything else it can be used for?
-a: yes it quickly shows which part of a trace are encrypted
the !crc is similar, it indicates the 2byte crc isn't correct all commands except some exchanges during the authentication also send a crc checksum(last two bytes). !crc indicates this checksum was not correct).
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Thx hat! You gave me a big hand.
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