Пт июл 21, 2017 14:02:23
Вс июл 23, 2017 08:07:59
Чт авг 17, 2017 21:52:42
Чт сен 07, 2017 20:15:03
Сб сен 09, 2017 23:18:27
Вс сен 10, 2017 13:43:53
Ср сен 13, 2017 18:41:08
Чт сен 14, 2017 21:29:10
Сб сен 23, 2017 14:32:21
Сб сен 23, 2017 16:30:25
Сб сен 23, 2017 20:59:42
Вт сен 26, 2017 22:36:15
Ср сен 27, 2017 12:31:25
// Wait for the CRC calculation to complete. Each iteration of the while-loop takes 17.73us.
for (uint16_t i = 5000; i > 0; i--) {
// DivIrqReg[7..0] bits are: Set2 reserved reserved MfinActIRq reserved CRCIRq reserved reserved
byte n = PCD_ReadRegister(DivIrqReg);
if (n & 0x04) { // CRCIRq bit set - calculation done
PCD_WriteRegister(CommandReg, PCD_Idle); // Stop calculating CRC for new content in the FIFO.
// Transfer the result from the registers to the result buffer
result[0] = PCD_ReadRegister(CRCResultRegL);
result[1] = PCD_ReadRegister(CRCResultRegH);
return STATUS_OK;
}
}
Чт сен 28, 2017 17:35:45
Сб сен 30, 2017 15:39:00
The challenge nT has a length of 32bits, but as mentioned before the LFSR is only 16 bits.This means that the 16 bits that are not accounted for are enerated by theLFSR from the initial seed and .The value of the LFSR updates with every clock tick (every 9.44Μs) and value depends on thetime the tag powers p nd when communication is invoked. Therefore, the challenge nonce,nT, since LFSR of the tag isdeterministic, can be replicated at anytime by controlling start up nd when communications begins. Initially, the state of theLFSR is only the input bit 1 and the rest of the register are 0 s.With each clock tick, the feedback bits are omputed using thespecified taps and XOR - ing them to generate a new input bit. This bit is fed back into the register onto the right and the registeris shifted to he eft. The operation can be defined as
Вт окт 03, 2017 17:29:14
0960090009FF09FF09FF09FF09FF09FF099009F6090B09C5
-> 010F [Reset]
-> B7 [Version]
<- 92
-> 010F113D2D302C002A8D2B3E148326701540 [Init]
-> 0952010C0D87 [Send REQA]
-> 8989 [Read REQA]
<- 0400
-> 09930920010C0D80 [Anticol]
-> 8989898989 [Read UID]
<- 90F60BC5A8
-> 09930970099009F6090B09C509A801030100 [Calculate CRC]
-> A2A1 [GET CRC]
<- CE6F
-> 09930970099009F6090B09C509A809CE096F010C0D80 [Select]
-> 898989 [Read SAK]
<- 08B6DD
-> 0960090009FF09FF09FF09FF09FF09FF099009F6090B09C5 [Auth string]
-> 010E [Authenticate]
<- 01
-> 89 [In FIFO?]
<- 00
-> 010F [Reset]
-> B7 [Version]
<- 92
-> 010F113D2D302C002A8D2B3E148326701540 [Init]
-> 0952010C0D87 [Send REQA]
-> 8989 [Read REQA]
<- 0400
-> 09930920010C0D80 [Anticol]
-> 8989898989 [Read UID]
<- 90F60BC5A8
-> 09930970099009F6090B09C509A801030100 [Calculate CRC]
-> A2A1 [GET CRC]
<- CE6F
-> 09930970099009F6090B09C509A809CE096F010C0D80 [Select]
-> 898989 [Read SAK]
<- 08B6DD
-> 0960090009FF09FF09FF09FF09FF09FF099009F6090B09C5 [Auth string]
-> 010E [Authenticate]
-> 88 [Status2Reg]
<- 08
-> 0930090001030100 [Calculate CRC]
-> A2A1 [GET CRC]
<- 02A8
-> 09300900090209A8010C0D80 [Send Read block 00 to Card]
-> 89898989898989 [Read]
<- 90F60BC5A88804
Ср окт 04, 2017 11:32:51
000000000000FF078069FFFFFFFFFFFF
-> 0960090309FF09FF09FF09FF09FF09FF099009F6090B09C5 [Auth string]
-> 010E [Authenticate]
-> 88 [Status2Reg]
<- 08
-> 0930090001030100 [Calculate CRC]
-> A2A1 [GET CRC]
<- 02A8
-> 09300900090209A8010C0D80 [Send Read block 00 to Card]
-> 89898989898989898989898989898989 [Read]
<- 90F60BC5A88804008500B42EF0BB6AA8
-> 0930090101030100 [Calculate CRC]
-> A2A1 [GET CRC]
<- 60AA
-> 09300901096009AA010C0D80 [Send Read block 00 to Card]
-> 89898989898989898989898989898989 [Read]
<- 05FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
-> 0930090201030100 [Calculate CRC]
-> A2A1 [GET CRC]
<- 108B
-> 093009020910098B010C0D80 [Send Read block 00 to Card]
-> 89898989898989898989898989898989 [Read]
<- 90909090909090909090909090909090
-> 0960090309FF09FF09FF09FF09FF09FF099009F6090B09C5 [Auth string]
-> 010E [Authenticate]
-> 88 [Status2Reg]
<- 08
-> 0930090001030100 [Calculate CRC]
-> A2A1 [GET CRC]
<- 02A8
-> 09300900090209A8010C0D80 [Send Read block 00 to Card]
-> 89898989898989898989898989898989 [Read]
<- 90F60BC5A88804008500B42EF0BB6AA8
-> 0A80 [Clear FIFO]
-> 0930090101030100 [Calculate CRC]
-> A2A1 [GET CRC]
<- 8BB9
-> 09300901098B09B9010C0D80 [Send Read block 00 to Card]
-> 89898989898989898989898989898989 [Read]
<- 00000000000000000000000000000000
-> 0A80 [Clear FIFO]
-> 0930090201030100 [Calculate CRC]
-> A2A1 [GET CRC]
<- 108B
-> 093009020910098B010C0D80 [Send Read block 00 to Card]
-> 89898989898989898989898989898989 [Read]
<- 00000000000000000000000000000000
-> 0A80 [Clear FIFO]
-> 0930090301030100 [Calculate CRC]
-> A2A1 [GET CRC]
<- 999A
-> 093009030999099A010C0D80 [Send Read block 00 to Card]
-> 89898989898989898989898989898989 [Read]
<- 000000000000FF078069FFFFFFFFFFFF
Чт окт 05, 2017 15:31:45
Пт окт 06, 2017 16:09:24
Сб окт 07, 2017 16:44:06