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© 2011 Wi-Fi Alliance. All Rights Reserved.
Used with the permission of the Wi-Fi Alliance under the terms set forth above.
Wi-Fi Simple Configuration
Technical Specification
Version 2.0.2
This document contains a specification for easy, secure setup and introduction of devices into WPA2-
enabled 802.11 networks. It is intended to meet the requirements determined by the Wi-Fi Protected
Setup working group in the Wi-Fi Alliance.
WI-FI ALLIANCE PROPRIETARY – SUBJECT TO CHANGE WITHOUT NOTICE
The Wi-Fi Alliance owns the copyright in this document and reserves all rights therein.
This document and any related materials may only be used by Wi-Fi Alliance members for
their internal use, such as quality assurance and pre-certification activities, and for their
participation in approved Wi-Fi Alliance activities, such as the Wi-Fi Alliance certification
program, unless otherwise permitted by the Wi-Fi Alliance through prior written consent.
A user of this document may duplicate and distribute copies of the document in connection
with the authorized uses described above, provided any duplication in whole or in part
includes the copyright notice and the disclaimer text set forth herein. Unless prior written
permission has been received from the Wi-Fi Alliance, any other use of this document and
all other duplication and distribution of this document are prohibited. Unauthorized use,
duplication, or distribution is an infringement of the Wi-Fi Alliance’s copyright.
Wi-Fi Simple Configuration Technical Specification v2.0.2
© 2011 Wi-Fi Alliance. All Rights Reserved.
Used with the permission of the Wi-Fi Alliance under the terms set forth above.
Document History
Version Date Status Comments
2.0.0.50 2010-08-17
TG Approved
First approved release of WSC 2.0 specification
2.0.0.51 2010-09-01 Draft Draft release version to public
2.0.0.52 2010-09-20 Draft Updates from Plugfest #3
2.0.0 2010-12-20 Final Public release version
2.0.1 2011-08-11 Final Added tablet PC to table 41
2.0.2 2012-01-30
Final
Change Headless Devices section to mandate
implementation of strong mitigation against a
brute force attack on the AP that uses a static
PIN.
Wi-Fi Simple Configuration Technical Specification v2.0.2
© 2011 Wi-Fi Alliance. All Rights Reserved.
Used with the permission of the Wi-Fi Alliance under the terms as stated in this document.
Page 3 of 154
Table of Contents
1 Introduction ........................................................................................................................... 11
1.1 Purpose .................................................................................................................. 11
1.2 Scope ..................................................................................................................... 11
1.3 Supported Usage Models ...................................................................................... 11
1.3.1 Primary Usage Models .......................................................................................... 11
1.3.2 Secondary Usage Models ...................................................................................... 12
1.4 Mental Model ........................................................................................................ 12
1.5 Design Approach .................................................................................................. 12
1.6 Solution Flexibility ............................................................................................... 12
1.7 User Experience .................................................................................................... 13
1.7.1 In-band Setup ........................................................................................................ 13
1.7.2 Out-of-Band Setup ................................................................................................ 14
2 References ............................................................................................................................. 15
3 Definitions............................................................................................................................. 16
4 Core Architecture .................................................................................................................. 17
4.1 Components and Interfaces ................................................................................... 17
4.1.1 Architectural Overview ......................................................................................... 17
4.1.2 Interface E ............................................................................................................. 18
4.1.3 Interface M ............................................................................................................ 19
4.1.4 Interface A ............................................................................................................ 20
4.2 Registration Protocol ............................................................................................ 20
4.3 Security Overview ................................................................................................ 22
4.3.1 In-band Configuration ........................................................................................... 23
4.3.2 Guidelines and Requirements for PIN values ....................................................... 25
4.3.3 Out-of-Band Configuration ................................................................................... 26
5 Initial WLAN Setup .............................................................................................................. 27
5.1 Standalone AP ....................................................................................................... 27
5.2 AP With an External Registrar ............................................................................. 28
5.2.1 EAP-based Setup of External Registrar ................................................................ 30
5.2.2 Ethernet-based Setup of External Registrar .......................................................... 32
6 Adding Member Devices ...................................................................................................... 33
Wi-Fi Simple Configuration Technical Specification v2.0.2
© 2011 Wi-Fi Alliance. All Rights Reserved.
Used with the permission of the Wi-Fi Alliance under the terms as stated in this document.
Page 4 of 154
6.1 In-band Setup Using a Standalone AP/Registrar .................................................. 34
6.2 In-band Setup Using an External Registrar .......................................................... 35
6.2.1 PIN based setup - External Registrar trigger first ................................................. 35
6.2.2 PBC based setup – External Registrar trigger first ............................................... 37
6.2.3 PIN based setup – Enrollee trigger first ................................................................ 38
6.2.4 PBC based setup – Enrollee trigger first ............................................................... 40
6.3 In-band Setup Using Multiple External Registrars ............................................... 41
6.4 Secure Setup with Legacy Enrollee ...................................................................... 44
6.4.1 Mental model mapping ......................................................................................... 44
7 Registration Protocol Definition ........................................................................................... 45
7.1 Registration Protocol Initiation ............................................................................. 45
7.2 Registration Protocol Messages ............................................................................ 47
7.2.1 Optional Parameters .............................................................................................. 49
7.2.2 Validation of Configuration Data ......................................................................... 49
7.3 Key Derivation ...................................................................................................... 50
7.4 Proof-of-possession of Device Password.............................................................. 52
7.4.1 PIN Checksums ..................................................................................................... 53
7.4.2 Device Password Splitting .................................................................................... 54
7.4.3 Device Password Usage in M1 and M2 ................................................................ 54
7.5 Key Wrap Algorithm ............................................................................................ 55
7.6 Key Summary and Classification .......................................................................... 56
7.7 EAP Transport of Registration Protocol ............................................................... 57
7.7.1 EAP Message Framing ......................................................................................... 58
7.7.2 EAP Messages ...................................................................................................... 60
7.7.3 EAP State Machine for Enrollee Registration ...................................................... 61
7.7.4 EAP State Machine for Adding an External Registrar ......................................... 62
7.8 UPnP Transport of Registration Protocol ............................................................. 63
7.9 Version Negotiation .............................................................................................. 64
8 Message Encoding ................................................................................................................ 65
8.1 Wi-Fi Simple Configuration TLV Data Format ................................................... 65
8.2 802.11 Management Frames ................................................................................. 66
8.2.1 Beacon Frame (C) ................................................................................................. 67
8.2.2 Association Request and Reassociation Request .................................................. 68
Wi-Fi Simple Configuration Technical Specification v2.0.2
© 2011 Wi-Fi Alliance. All Rights Reserved.
Used with the permission of the Wi-Fi Alliance under the terms as stated in this document.
Page 5 of 154
8.2.3 Association Response and Reassociation Response ............................................. 69
8.2.4 Probe Request (D-E or D-R) ................................................................................. 69
8.2.5 Probe Response (D-AP/Registrar) ........................................................................ 70
8.3 Registration Protocol Message Definitions .......................................................... 71
8.3.1 Message M1 .......................................................................................................... 72
8.3.2 Message M2 .......................................................................................................... 73
8.3.3 Message M2D ....................................................................................................... 74
8.3.4 Message M3 .......................................................................................................... 75
8.3.5 Message M4 .......................................................................................................... 75
8.3.6 Message M5 .......................................................................................................... 76
8.3.7 Message M6 .......................................................................................................... 76
8.3.8 Message M7 .......................................................................................................... 77
8.3.9 Message M8 .......................................................................................................... 78
8.3.10 WSC_ACK Message ............................................................................................ 80
8.3.11 WSC_NACK Message.......................................................................................... 80
8.3.12 WSC_Done Message ............................................................................................ 80
8.4 AP Settings Message Definitions.......................................................................... 81
8.4.1 SetSelectedRegistrar Message .............................................................................. 81
9 Security Configuration Requirements ................................................................................... 83
10 NFC Out-of-Band Interface Specification ............................................................................ 84
10.1 Overview ............................................................................................................... 84
10.2 NFC Usage Models ............................................................................................... 84
10.2.1 Password Token .................................................................................................... 85
10.2.2 Configuration Token ............................................................................................. 85
10.2.3 Connection Handover ........................................................................................... 86
10.3 Requirements for NFC Out-of-Band Support ....................................................... 89
10.3.1 Enrollee Requirements .......................................................................................... 89
10.3.2 Registrar Requirements ......................................................................................... 89
10.4 Informative: NFC Forum Specifications .............................................................. 89
10.4.1 NFC Data Exchange Format (NDEF) Specification ............................................. 89
10.4.2 NFC Forum Tag Operation Specifications ........................................................... 89
10.4.3 Logical Link Control Protocol (LLCP) Specification .......................................... 90
10.4.4 Connection Handover Specification ..................................................................... 90
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