Yubikey 4 Smart Card
3B
F8
13
00
00
81
31
FE
15
59
75
62
69
6B
65
79
34
D4
11
Total reports
100%
Success rate
2017
First report
2021-01-23
Last report
ATR Analysis
ISO 7816-3 · local
Full analysis on smartcard-atr.apdu.fr ↗
Convention
direct
Protocol
T=1
Baud rate (TA1)
Fi=372, Di=4, fmax=4MHz, 93.00 cycles/ETU
Guard time (TC1)
0 etu
IFSC (TA3, T=1)
254 bytes
Waiting times (TB3, T=1)
CWI=5 (CWT=43 etu), BWI=1 (BWT≈714,240 etu)
Historical bytes
597562696B657934
Proprietary / unstructured
TCK checksum
✓ valid
D4
| # | Byte | Name | Description |
|---|---|---|---|
| 0 | 3B | TS | Direct convention (TS = 3B) |
| 1 | F8 | T0 | Format byte: 8 historical bytes, Y1=0b1111 (TA1=present, TB1=present, TC1=present, TD1=present) |
| 2 | 13 | TA1 | TA1: Fi=372, Di=4 → 93 cycles/ETU at 5MHz |
| 3 | 00 | TB1 | TB1: deprecated Vpp programming voltage parameter |
| 4 | 00 | TC1 | TC1: extra guard time = 0 etu |
| 5 | 81 | TD1 | TD1: T=1 protocol indicator, Y2=0b1000 (TA2=absent, TB2=absent, TC2=absent, TD2=present) |
| 6 | 31 | TD2 | TD2: T=1 protocol indicator, Y3=0b0011 (TA3=present, TB3=present, TC3=absent, TD3=absent) |
| 7 | FE | TA3 | TA3: IFSC=254 (max information field size for card) |
| 8 | 15 | TB3 | TB3: CWI=5 (CWT=43 etu), BWI=1 (BWT≈714,240 etu) |
| 9 | 59 | T1 | Historical byte 1 |
| 10 | 75 | T2 | Historical byte 2 |
| 11 | 62 | T3 | Historical byte 3 |
| 12 | 69 | T4 | Historical byte 4 |
| 13 | 6B | T5 | Historical byte 5 |
| 14 | 65 | T6 | Historical byte 6 |
| 15 | 79 | T7 | Historical byte 7 |
| 16 | 34 | T8 | Historical byte 8 |
| 17 | D4 | TCK | Check byte: XOR(T0…TCK) = 00 → ✓ valid |
Software compatibility
Operating system compatibility
| OS | Architecture | Service pack | Reports | Success rate | |
|---|---|---|---|---|---|
| Windows Server 2012 | x64 | — | 11 |
100%
|
Details |
Provider / middleware compatibility
| Provider | DLL | Version | Company | Reports | Success rate | |
|---|---|---|---|---|---|---|
| Microsoft Base Smart Card Crypto Provider | ykmd.dll |
4.0.4.164 |
Yubico AB | 4 |
100%
|
Details |
| Microsoft Base Smart Card Crypto Provider | ykmd.dll |
3.3.1.5 |
Yubico AB | 2 |
100%
|
Details |
| Microsoft Base Smart Card Crypto Provider | ykmd.dll |
3.7.0.152 |
Yubico AB | 2 |
100%
|
Details |
| Microsoft Base Smart Card Crypto Provider | ykmd.dll |
3.7.3.160 |
Yubico AB | 2 |
100%
|
Details |
| Microsoft Base Smart Card Crypto Provider | ykmd.dll |
4.1.1.210 |
Yubico AB | 1 |
100%
|
Details |