Enter an ATR (Answer To Reset) and I will parse it for you.
Parsing ATR:
| TS = 0x3B | Direct Convention |
|---|---|
| T0 = 0xFD | Y(1): b1111, K: 13 (historical bytes) |
| TA(1) = 0x13 | Fi=372, Di=4, 93 cycles/ETU (43010 bits/s at 4.00 MHz, 53763 bits/s for fMax=5 MHz) |
| TB(1) = 0x00 | VPP is not electrically connected |
| TC(1) = 0x00 | Extra guard time: 0 |
| TD(1) = 0x81 | Y(i+1) = b1000, Protocol T=1 |
| ---- | |
| TD(2) = 0x31 | Y(i+1) = b0011, Protocol T=1 |
| ---- | |
| TA(3) = 0xFE | IFSC: 254 |
| TB(3) = 0x15 | Block Waiting Integer: 1 - Character Waiting Integer: 5 |
| ---- | |
| Historical bytes | 80 73 C0 21 C0 57 59 75 62 69 4B 65 79 |
| Category indicator byte: 0x80 | (compact TLV data object) Tag: 7, Len: 3 (card capabilities) Selection methods: 192 - DF selection by partial DF name - DF selection by full DF name Data coding byte: 33 - Behaviour of write functions: proprietary - Value 'FF' for the first byte of BER-TLV tag fields: invalid - Data unit in quartets: 1 Command chaining, length fields and logical channels: 192 - Command chaining - Extended Lc and Le fields - Logical channel number assignment: No logical channel - Maximum number of logical channels: 1 Tag: 5, Len: 7 (card issuer's data) Card issuer data: 59 75 62 69 4B 65 79 "YubiKey" |
| TCK = 0x40 | correct checksum |
Possibly identified card:
3B FD 13 00 00 81 31 FE 15 80 73 C0 21 C0 57 59 75 62 69 4B 65 79 40
Yubico YubiKey 5 NFC (PKI)
The parsing code is part of pyscard and is available at parseATR.py.
The list of known ATR is also available online at smartcard_list.txt.
My blog contains a serie of artickes about ATR bytes.