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Used with the permission of Wi-Fi Alliance under the terms as stated in this document.

Wi-Fi Protected Setup™ Specification

Version 2.0.8

WI-FI ALLIANCE PROPRIETARY – SUBJECT TO CHANGE WITHOUT NOTICE

This document may be used with the permission of Wi-Fi Alliance under the terms set forth herein.

By your use of the document, you are agreeing to these terms. Unless this document is clearly designated as an approved

specification, this document is a work in process and is not an approved Wi-Fi Alliance specification. This document is subject to

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assumes no responsibility for errors or omissions in this document. This copyright permission does not constitute an endorsement of

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Wi-Fi Protected Setup™ Specification v2.0.8 
© 2020 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 
Introduction .......................................................................................................................10 
1  Scope ................................................................................................................10 
2  Supported Usage Models ...................................................................................10 
2.1  Primary Usage Models .....................................................................................10 
2.2  Secondary Usage Models ................................................................................10 
3  Design Approach ...............................................................................................11 
4  Solution Flexibility ..............................................................................................11 
5  User Experience ................................................................................................12 
5.1  In-band Setup ...................................................................................................12 
5.2  Out-of-Band Setup ...........................................................................................12 
References ........................................................................................................................14 
Definitions .........................................................................................................................15 
Core Architecture ..............................................................................................................17 
1  Components and Interfaces ...............................................................................17 
1.1  Architectural Overview ....................................................................................17 
1.2  Interface E ........................................................................................................18 
1.3  Interface M ........................................................................................................19 
1.4  Interface A ........................................................................................................20 
2  Registration Protocol ..........................................................................................20 
3  Security Overview ..............................................................................................22 
3.1  In-band Configuration ......................................................................................23 
3.2  Guidelines and Requirements for PIN values ................................................25 
3.3  Out-of-Band Configuration ..............................................................................26 
Initial WLAN Setup ............................................................................................................27 
1  Standalone AP ...................................................................................................27 
2  AP With an External Registrar............................................................................28 
2.1  EAP-based Setup of External Registrar .........................................................30 
2.2  Ethernet-based Setup of External Registrar ..................................................32 
Adding Member Devices ...................................................................................................33 
1  In-band Setup Using a Standalone AP/Registrar ...............................................34 
2  In-band Setup Using an External Registrar ........................................................35 
2.1  PIN based setup - External Registrar trigger first ..........................................35 
2.2  PBC based setup – External Registrar trigger first .......................................37 
2.3  PIN based setup – Enrollee trigger first .........................................................38 

Wi-Fi Protected Setup™ Specification v2.0.8 
© 2020 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 
 
2.4  PBC based setup – Enrollee trigger first ........................................................40 
3  In-band Setup Using Multiple External Registrars ..............................................41 
4  Secure Setup with Legacy Enrollee ...................................................................44 
4.1  Mental model mapping ....................................................................................44 
Registration Protocol Definition .........................................................................................45 
1  Registration Protocol Initiation............................................................................45 
2  Registration Protocol Messages .........................................................................47 
2.1  Optional Parameters ........................................................................................49 
2.2  Validation of Configuration Data.....................................................................50 
3  Key Derivation ...................................................................................................50 
4  Proof-of-possession of Device Password ...........................................................52 
4.1  PIN Checksums ................................................................................................53 
4.2  Device Password Splitting ..............................................................................54 
4.3  Device Password Usage in M1 and M2 ...........................................................54 
5  Key Wrap Algorithm ...........................................................................................56 
6  Key Summary and Classification ........................................................................56 
7  EAP Transport of Registration Protocol ..............................................................57 
7.1  EAP Message Framing ....................................................................................58 
7.2  EAP Messages .................................................................................................60 
7.3  EAP State Machine for Enrollee Registration ................................................62 
7.4  EAP State Machine for Adding an External Registrar ...................................63 
8  UPnP Transport of Registration Protocol ...........................................................64 
9  Version Negotiation ............................................................................................65 
Message Encoding ............................................................................................................66 
1  Wi-Fi Simple Configuration TLV Data Format ....................................................66 
2  802.11 Management Frames .............................................................................67 
2.1  Beacon Frame (C) ............................................................................................68 
2.2  Association Request and Reassociation Request ........................................69 
2.3  Association Response and Reassociation Response ...................................70 
2.4  Probe Request (D-E or D-R) ............................................................................70 
2.5  Probe Response (D-AP/Registrar) ..................................................................71 
3  Registration Protocol Message Definitions .........................................................72 
3.1  Message M1 ......................................................................................................73 
3.2  Message M2 ......................................................................................................74 
3.3  Message M2D ...................................................................................................75 

Wi-Fi Protected Setup™ Specification v2.0.8 
© 2020 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 
 
3.4  Message M3 ......................................................................................................76 
3.5  Message M4 ......................................................................................................76 
3.6  Message M5 ......................................................................................................77 
3.7  Message M6 ......................................................................................................77 
3.8  Message M7 ......................................................................................................78 
3.9  Message M8 ......................................................................................................79 
3.10  WSC_ACK Message .........................................................................................81 
3.11  WSC_NACK Message ......................................................................................81 
3.12  WSC_Done Message .......................................................................................82 
4  AP Settings Message Definitions .......................................................................82 
4.1  SetSelectedRegistrar Message .......................................................................82 
Security Configuration Requirements ................................................................................84 
NFC Out-of-Band Interface Specification ...........................................................................85 
1  NFC Usage Models ............................................................................................85 
1.1  Password Token ..............................................................................................85 
1.2  Configuration Token ........................................................................................86 
1.3  Connection Handover ......................................................................................87 
2  Requirements for NFC Out-of-Band Support ......................................................90 
2.1  Enrollee Requirements ....................................................................................90 
2.2  Registrar Requirements ..................................................................................91 
2.3  P2P Registrar Requirements ...........................................................................91 
Pushbutton Configuration ..................................................................................................92 
1  Introduction ........................................................................................................92 
2  User Experience ................................................................................................92 
3  PBC Technical Description ................................................................................94 
4  PBC Security Considerations .............................................................................97 
Data Element Definitions ...................................................................................................99 
Protocol Implementation Conformance  Specification (PICS) .......................................... 131 
Annex A -  Out-of-Band Channel Considerations ............................................................... 135 
Annex B -  Security Analysis of Registration Protocol ........................................................ 137 
Out-Of-Band Channels ........................................................................................................ 137 
Out-of-band Channel Characteristics .................................................................................. 138 
Annex C -  Out-of-band Setup Using a Standalone AP/Registrar ....................................... 139 
Setup steps 139 
Annex D -  Out-of-band Setup Using an External Registrar ............................................... 140 