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

Wi-Fi Simple Configuration

Technical Specification

Version 2.0.5

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 Wi-Fi Alliance.

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

revision or removal at any time without notice. Information contained in this document may be used at your sole risk. Wi-Fi Alliance

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

the products or services. Wi-Fi Alliance trademarks and certification marks may not be used unless specifically allowed by Wi-Fi

Alliance.

Wi-Fi Alliance has not conducted an independent intellectual property rights ("IPR") review of this document and the information

contained herein, and makes no representations or warranties regarding IPR, including without limitation patents, copyrights or trade

secret rights. This document may contain inventions for which you must obtain licenses from third parties before making, using or

selling the inventions.

Wi-Fi Alliance owns the copyright in this document and reserves all rights therein. A user of this document may duplicate and

distribute copies of the document in connection with the authorized uses described herein, 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

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 Wi-Fi Alliance’s copyright.

NO REPRESENTATIONS OR WARRANTIES (WHETHER EXPRESS OR IMPLIED) ARE MADE BY WI-FI ALLIANCE AND WI-FI

ALLIANCE IS NOT LIABLE FOR AND HEREBY DISCLAIMS ANY DIRECT, INDIRECT, PUNITIVE, SPECIAL, INCIDENTAL,

CONSEQUENTIAL, OR EXEMPLARY DAMAGES ARISING OUT OF OR IN CONNECTION WITH THE USE OF THIS

DOCUMENT AND ANY INFORMATION CONTAINED IN THIS DOCUMENT.

Wi-Fi Simple Configuration Technical Specification v2.0.4

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

Page 3 of 155

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 ........................................................................ 11

1.4 Design Approach ..................................................................................... 12

1.5 Solution Flexibility .................................................................................... 12

1.6 User Experience ...................................................................................... 13

1.6.1 In-band Setup .......................................................................................... 13

1.6.2 Out-of-Band Setup ................................................................................... 14

2 References ............................................................................................................. 15

3 Definitions .............................................................................................................. 16

4 Core Architecture ................................................................................................... 18

4.1 Components and Interfaces ..................................................................... 18

4.1.1 Architectural Overview ............................................................................. 18

4.1.2 Interface E ............................................................................................... 19

4.1.3 Interface M ............................................................................................... 20

4.1.4 Interface A ............................................................................................... 21

4.2 Registration Protocol................................................................................ 21

4.3 Security Overview .................................................................................... 23

4.3.1 In-band Configuration .............................................................................. 24

4.3.2 Guidelines and Requirements for PIN values .......................................... 26

4.3.3 Out-of-Band Configuration ....................................................................... 27

5 Initial WLAN Setup ................................................................................................. 28

5.1 Standalone AP ......................................................................................... 28

5.2 AP With an External Registrar ................................................................. 29

5.2.1 EAP-based Setup of External Registrar ................................................... 31

5.2.2 Ethernet-based Setup of External Registrar ............................................ 33

6 Adding Member Devices ........................................................................................ 34

6.1 In-band Setup Using a Standalone AP/Registrar ..................................... 35

6.2 In-band Setup Using an External Registrar .............................................. 36

Wi-Fi Simple Configuration Technical Specification v2.0.4

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

Page 4 of 155

6.2.1 PIN based setup - External Registrar trigger first ..................................... 36

6.2.2 PBC based setup – External Registrar trigger first .................................. 38

6.2.3 PIN based setup – Enrollee trigger first ................................................... 39

6.2.4 PBC based setup – Enrollee trigger first .................................................. 41

6.3 In-band Setup Using Multiple External Registrars ................................... 42

6.4 Secure Setup with Legacy Enrollee ......................................................... 45

6.4.1 Mental model mapping............................................................................. 45

7 Registration Protocol Definition .............................................................................. 46

7.1 Registration Protocol Initiation ................................................................. 46

7.2 Registration Protocol Messages .............................................................. 48

7.2.1 Optional Parameters ................................................................................ 50

7.2.2 Validation of Configuration Data .............................................................. 51

7.3 Key Derivation ......................................................................................... 51

7.4 Proof-of-possession of Device Password ................................................ 53

7.4.1 PIN Checksums ....................................................................................... 54

7.4.2 Device Password Splitting ....................................................................... 55

7.4.3 Device Password Usage in M1 and M2 ................................................... 55

7.5 Key Wrap Algorithm ................................................................................. 57

7.6 Key Summary and Classification ............................................................. 57

7.7 EAP Transport of Registration Protocol ................................................... 58

7.7.1 EAP Message Framing ............................................................................ 59

7.7.2 EAP Messages ........................................................................................ 61

7.7.3 EAP State Machine for Enrollee Registration .......................................... 63

7.7.4 EAP State Machine for Adding an External Registrar .............................. 64

7.8 UPnP Transport of Registration Protocol ................................................. 65

7.9 Version Negotiation ................................................................................. 66

8 Message Encoding ................................................................................................. 67

8.1 Wi-Fi Simple Configuration TLV Data Format .......................................... 67

8.2 802.11 Management Frames ................................................................... 68

8.2.1 Beacon Frame (C) ................................................................................... 69

8.2.2 Association Request and Reassociation Request ................................... 70

8.2.3 Association Response and Reassociation Response .............................. 71

8.2.4 Probe Request (D-E or D-R) .................................................................... 71

Wi-Fi Simple Configuration Technical Specification v2.0.4

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

Page 5 of 155

8.2.5 Probe Response (D-AP/Registrar) ........................................................... 72

8.3 Registration Protocol Message Definitions .............................................. 73

8.3.1 Message M1 ............................................................................................ 74

8.3.2 Message M2 ............................................................................................ 75

8.3.3 Message M2D .......................................................................................... 76

8.3.4 Message M3 ............................................................................................ 77

8.3.5 Message M4 ............................................................................................ 77

8.3.6 Message M5 ............................................................................................ 78

8.3.7 Message M6 ............................................................................................ 78

8.3.8 Message M7 ............................................................................................ 79

8.3.9 Message M8 ............................................................................................ 80

8.3.10 WSC_ACK Message................................................................................ 82

8.3.11 WSC_NACK Message ............................................................................. 82

8.3.12 WSC_Done Message .............................................................................. 83

8.4 AP Settings Message Definitions ............................................................. 83

8.4.1 SetSelectedRegistrar Message ............................................................... 83

9 Security Configuration Requirements ..................................................................... 85

10 NFC Out-of-Band Interface Specification ............................................................... 86

10.1 NFC Usage Models ................................................................................. 86

10.1.1 Password Token ...................................................................................... 86

10.1.2 Configuration Token ................................................................................ 87

10.1.3 Connection Handover .............................................................................. 88

10.2 Requirements for NFC Out-of-Band Support ........................................... 91

10.2.1 Enrollee Requirements ............................................................................ 91

10.2.2 Registrar Requirements ........................................................................... 92

10.2.3 P2P Registrar Requirements ................................................................... 92

11 Push Button Configuration ..................................................................................... 93

11.1 Introduction .............................................................................................. 93

11.2 User Experience ...................................................................................... 93

11.3 PBC Technical Description ...................................................................... 95

11.4 PBC Security Considerations ................................................................... 98

12 Data Element Definitions ...................................................................................... 100

13 Protocol Implementation Conformance Specification (PICS) .............................. 132

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