WO2006106393A2 - Access management in a wireless local area network - Google Patents
Access management in a wireless local area network Download PDFInfo
- Publication number
- WO2006106393A2 WO2006106393A2 PCT/IB2006/000695 IB2006000695W WO2006106393A2 WO 2006106393 A2 WO2006106393 A2 WO 2006106393A2 IB 2006000695 W IB2006000695 W IB 2006000695W WO 2006106393 A2 WO2006106393 A2 WO 2006106393A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- key
- wireless network
- access
- terminal device
- communication channel
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
- H04L9/3215—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using a plurality of channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/06—Network architectures or network communication protocols for network security for supporting key management in a packet data network
- H04L63/065—Network architectures or network communication protocols for network security for supporting key management in a packet data network for group communications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/18—Network architectures or network communication protocols for network security using different networks or channels, e.g. using out of band channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0838—Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/50—Secure pairing of devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
- H04L2209/80—Wireless
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/06—Authentication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- SES Secure Easy Setup
- FIG. 2 illustrates an example of an "in-band" solution. Pairing of the new device and the AP in the in-band approach is done utilizing WLAN pairing methods.
- the PSK may be derived from an in-band key agreement protocol.
- the OOB channel can be used to transfer the authentication key (AK) and the address of the AP 410 to the new device 414, which triggers the in-band key agreement (i.e., the user does not have to press any buttons).
- the "out-of-band" channel is not limited to NFC, but it can be any means of passing the AK (and the network parameters, where feasible) to the New Device.
- the out-of-band channel may consist of a Personal Identification Number (PIN) typed by the user.
- PIN Personal Identification Number
- the mobile telephone may display a picture of the appliance transmitted from the appliance on the phone display.
- the user by pushing a button, can change the network parameters for only the appliance shown in the display, thus giving users a better understanding of which appliances to pair.
- the pairing is between a device and the access point (and not between devices), but the idea need not be limited to the WLAN case.
- an image of the device may be displayed on a display of the AP, or alternatively, an image of the AP may be displayed on a display of the device.
- An alternative embodiment of the invention proving the identity with a (unanswered) call may be performed as follows: the device to be authenticated (device A) sends its phone number over a wireless telecommunication connection to the device that wishes to authenticate itself (device B), i.e., device A calls device B.
- An authentication application in device B stores the phone number of device A in an access database and waits for some predetermined or randomly chosen time and dials device A via a wireless telecom network.
- device A detects the call it immediately informs device B about the call via a wireless connection (such as Bluetooth or WLAN) including the phone number of device B and its own phone number.
- A's phone number may optionally be used to computer the key used to protect the wireless connection.
- An authentication application in device B may check now if the phone number of device A is in the access database, if the response from A came fast enough to the call it made (during some predetermined period of time), thereby causing B to approve A's identity (i.e., the phone number it sent). This method is useful, e.g., in step 403 in Fig 4.
- this information may now include the phone number of the device B, the phone number of device A and also Bluetooth identification information.
- A's phone number may optionally be used to computer the key used to protect the wireless connection.
- An authentication application in device B may check if the phone number and the Bluetooth identification information of device A are in the access database, if the response from device A came fast enough to the call it made (during some predetermined period of time), thereby causing device B to approve device A's identity (i.e., the phone number it sent). Authentication may also be done by checking a pair A (phone number, Bluetooth identification information) in the access database. This method may be useful, e.g., in step 403 in Fig 4. [0047] The immediately above described method may be used, e.g., in the following example situations:
- a WLAN access point device (device B) and a new device (device A) have wireless telecom capabilities. This wireless telecom access is used to share information needed for establishing WLAN access between the devices, like in step 403 in Fig. 4. In this case the devices may initialize WLAN access set-up automatically after sharing needed information. Alternatively, the set-up of WLAN access may be manually initiated by the user.
- Mr. Marty Manager sits in a meeting with his customers and realizes that he does not have the latest presentation of his product stored on his smartphone. He sends a SMS message to his secretary and asks her to send it via ad-hoc WLAN to his phone. His secretary launches an ad-hoc application on her the phone, which initiates the ad-hoc connection by sending her phone number to Marty's phone, thus initiating the connection. Marty accepts the connection from his secretary (it is shown based on the number the call was made to - or was intended to be made to, depending on the security level settings). When the connection is up, the file may be sent to Marty's smartphone.
- the owner may use the AP's management interface to mark the target device as "revoked.” Thereafter, the PSK of that device is removed and the AP may add the MAC address of the device to a list of revoked devices. A device whose MAC address is on that list will not be able to establish a PSK with the AP, i.e., it will not be able to do Step (1) above, unless access has been re-granted to the device.
- One advantage of this approach is that the new device and the AP can derive the PSK independently, without new key agreement protocol messages. Knowledge of AK and the device's MAC address is enough.
- a disadvantage of this approach is that the AP must keep track of revoked MAC addresses. Also, this approach is less secure than deriving the PSK from the AK using a key agreement protocol, because MAC addresses can be forged.
- allowing a previously revoked device back into the network requires the delegator to interact with the AP to remove its MAC address from the list of revoked devices, thereby requiring knowledge of an additional protocol.
- an authenticated devices database may be used (see table 2).
- the AP may contain an authenticated devices database, e.g., a table, storing (1) the MAC address of each device that is part of the WLAN network and (2) a key, PSK, that the AP shares with the device: ⁇ MAC address, PSK ⁇ .
- the AP searches the MAC address of the contacting device from that table and uses the associated PSK in communicating with that device if the MAC address is found. If the MAC address is not found, the AP may, e.g., refuse to communicate with the device, send a predetermined message to the device, or use some other procedure defined for unauthenticated devices.
- the authenticated devices database may further include a device group (DG) record: ⁇ MAC address, PSK, DG ⁇ .
- Type may identify a device, e.g., as "unauthenticated,” in which case the AK field would be empty.
- the Type value could be "Guest,” in which case the AK would be that reserved for guests.
- the Type value could be "Home,” in which case the AK will be that reserved for the home devices, such as consumer electronics devices or domestic appliances.
- Other Type values may include "Sensor" describing different sensors connected to the AP. The specific number of different types is not limited.
- the DG record of a device is initialized based on the value of the AK that the device knows, e.g., when that device joins the network. Additionally, the database may have a column describing who has given the access rights. Additionally, the device group may include a column for Original AK (OAK). Table 2 shows an example of information that may be included in an authenticated devices database. Other Type values may alternatively be used depending on system needs, e.g., an expiration date associated with a database entry to ensure automatic cancellation of user rights (otherwise revocation may occur when the user is removed from the database or when the expiration time is cancelled or changed). An example of an authenticated devices database is shown below in Table 2.
- a master device may wirelessly access and manage the authenticated devices database.
- the authenticated devices database may be accessed by a personal computer in a WLAN home network.
- a revocation of a user may happen by removing the user from the list or canceling or changing the user device's expiry date/time.
- the table may also include expiry dates for user devices. This ensures automatic cancellation of user rights.
- the user can use the "device name" field to identify the devices whose access should be revoked.
- the Broadcom proposal may be modified according to one or more aspects of the invention, where the key agreement protocol preferably supports optional authentication.
- the AK type is also stored. Two types of reset may be used, one to remove all guest security associations (e.g., long button press) and a second to completely reset the system.
- the AP may be permanently in a mode where it can accept authenticated requests for PSKs, i.e., there is no requirement for button presses in order to reach this mode.
- the SES protocol assumes that both the client device and the access point (AP) have a button (the button can be a software or harware button or switch, e.g., on/off switch).
- the user In order to add a new client device to the WLAN network, the user first presses a button on the AP and then on the client device. The result of these two button presses is that the client receives a WPA ("WiFi Protected Access”) key and an SSID ("Service Set Identifier”) from the AP.
- WPA WiFi Protected Access
- SSID Service Set Identifier
- aspects of the present invention further improve on the systems and methods described above. For example, as will be described below, aspects of the present invention make network access more secure and user accessible in situations outside of an individual user's home. As even more specific examples, suitable systems and methods may be provided to allow visitors, for example, in hotels, restaurants, and the like, to securely, temporarily, and easily access the network system.
- a WPA key is the specification by WiFi Alliance based on a version of 802.1 Ii. It is intended to be a stopgap measure until 802.1 Ii is ready.
- WPA-2 is intended to be 802. Hi. 802. Hi is an official IEEE standard for security of Wireless LANs.
- the WPA key is a pre-shared key between the WLAN client and an access point (also called a "PSK" herein).
- An SSID is a unique identifier for a WLAN network. Access points (APs) broadcast the SSDD.
- a client may be added to a WLAN network by pressing a button provided on the AP for an extended time period (e.g., five seconds). While the AP generates the WPA key and the SSID, it will flash LED lights or give some other indication to the user. If the AP had any existing pairings, they will be removed during this process. Once a new network is generated, users can add new devices to the network by pressing a single button on the AP and the client device.
- an extended time period e.g., five seconds
- FIG. 6 illustrates the protocol of adding new clients into a network using the SES protocol.
- a button press on the AP 610 causes the AP to go into reception mode for some period of time, e.g., two minutes. That is, the AP waits in a state for that time where it is available to establish secure tunnel communication with a client device.
- a button press on client device 611 initiates a search by the client to locate an AP, e.g., AP 610, which is in reception mode. After the client 611 has found AP 610, the client 611 establishes a secure tunnel with AP 610 in step 603.
- the client 611 receives a protocol message for continuing secure tunnel establishment.
- the protocol message may include the WPA key and SSID.
- the SES protocol of Figure 6 is user-friendly and somewhat secure. However, it still has a few drawbacks, including that client pairing with an unintended AP is possible, AP pairing with an unintended client is possible, man-in-the-middle attacks are possible, and all the pairings are permanent. It is not possible to give temporary access, for example, to visitors.
- Some of these vulnerabilities assume that there is another, possibly malicious AP or client present and in reception mode (these are denoted as "AP_OTHER” and "CLIENT_OTHER” in the description below).
- the AP that the user wants to pair with her client is designated as "AP_OK” and her client is designated as "CLIENT_OK” in the description below.
- Client pairing with an unintended AP can be prevented in various ways. First, if the client finds more than one AP, the client can abort the pairing procedure and warn the user. Second, the access points can be shipped with predefined names (such as "Tiger" and "Lion") that are drawn from a relatively large pool of names, and these names may be printed on top of the AP. If the client finds more than one AP, the user may then be asked to select the correct AP from a list of names. This feature can help reduce accidents. If there is more than one AP with the same name, then the client may be adapted to abort the pairing procedure.
- predefined names such as "Tiger" and "Lion”
- a client also can pair with an unintended AP if the user presses the button on the client device after the predetermined amount of time (e.g., two minutes) from the button pressing on the AP_OK device such that the AP_OK device is no longer in reception mode.
- This situation could be prevented, for example, if the AP gives some indication (such as flashing light) when it is in reception mode and a different kind of indication (such as constant light for five seconds) when the pairing has been successfully established.
- the user could verify after pressing the button on client that the indication on AP has changed from the reception mode to the successfully paired mode.
- the client user can see, prior to pressing the client button, whether the AP is in receiving mode. If a successful pairing does not happen, but rather the client has paired with AP_OTHER, then the incorrect pairing may be removed from the client manually.
- An AP pairing with an unintended client can be prevented as well.
- an AP can pair with a CLIENT OTHER if the user of CLIENT_OTHER presses the button on his/her client device faster than the user of CLIENT OK device presses his/her button.
- a warning message may be sent to CLIENT_OK.
- This situation may be detected and handled in a variety of different ways. For example, the situation may be detected if there is a pairing protocol between the CLIENT and the AP and the AP continues to listen to client requests for some time even after a first client successfully completes a pairing, e.g., until the AP pairing time interval (e.g., 2 minutes in this example system and method) runs out.
- the AP pairing time interval e.g. 2 minutes in this example system and method
- CLIENTJDTHER pairs first, then when CLIENT_OK tries to pair with AP_OK, AP_OK will return a warning message to CLIENT OK indicating that pairing is no longer possible and the reason for it (e.g., that another device has already paired).
- CLIENT_OK may be adapted to display a message to the user saying something like "AP refused to admit your device because another device got there before you. Hold down the cancel key on the AP for 3 seconds to kick the other device out of your AP' s network," or other appropriate message based on the system design.
- CLIENT_OTHER arrives before CLIENT_OK, the AP might not recognize CLIENT_OK and/or it might not recognize that a wrong user (CLIENT_OTHER) has been paired (the AP might not have any way of recognizing these situations). For this reason, the AP might not be adapted to take any action automatically, on its own, but rather, the AP sends a warning message at least to the client device attempting the later pairing. If CLIENT_OK receives the warning message, then the user of CLIENT_OK can perform the REMOVE_LAST_OPERATION described below and/or take other appropriate action.
- CLIENT_OTHER receives the warning, then, by definition, its user cannot act on the warning because that user presumably will not have physical access to do the REMOVE_LAST_OPERATION function on the AP (e.g., the unauthorized client user presumably will not have physical access to the AP).
- a REMOVE_LAST_OPERATION function associated with the AP may be performed at any desired time, for example, when the user receives a warning message at CLIENT-OK as described above. Performing this operation erases, terminates, or otherwise eliminates the unintended pairing established with CLIENT_OTHER, and optionally, again makes the AP available for pairing with CLIENT_OK.
- REMOV ⁇ _LAST_OPERATION function may be activated, for example, by pressing the same SES button longer or shorter than in a normal pairing, or, if desired, another button may be provided for this operation.
- Man-in-the-middle attacks may be prevented by allowing the user to compare the hashes of the agreed pairwise WPA key. For example, if both the client and the AP have a single LED, the devices could present the hash of the AP's public key one bit a time with the LED (1-bit could be presented with a green light and 0-bit with no light, for example), to thus ensure that the client has paired with AP_OK. If both devices have small displays, the hash could be presented one byte at a time as hexadecimal characters. If both devices have audio output, the hash could be represented as a sound sequence (using different frequencies or different amplitudes to represent 1 and 0). The AP may broadcast a list of its hash outputting capabilities, and the client is assumed to choose one from the list.
- This comparing process is optional. If the user does nothing after the normal SES protocol, no comparison of hashes would be performed. However, if the user wants to compare hashes, she can perform a COMPARE_HASHES_OPERATION after the normal SES protocol. If users do not use the COMPARE_HASHES_OPERATION, the same level of security as in the original SES may be provided and achieved. The COMPARE_HASHES_OPERATION, however, allows a security-conscious user to achieve a higher level of security against an active man-in-the-middle.
- both of the devices show the first part of the hash. If the hash parts are different, a man-in-the-middle attack has occurred and the user may be prompted or otherwise know to perform the REMOVE_LAST_OPERATION on the AP. If the hash parts are identical, the user can either do nothing and this pairing will be accepted. Alternatively, the user can select NEXT_PART_OPERATION on both of the devices. As a result of this operation, both of the devices show the next part of the hash and the user can again choose either to remove this pairing, accept this pairing by doing nothing, or move on to the next hash part. Comparing hashes using audio output may be one desirable user-friendly approach because the human ear can more easily differentiate between sound sequences that are out of key or out of phase.
- the pairing protocol can be based, for example, on MANA ("Manual Authentication for Wireless Devices", Gehrmann et al, Cryptobytes Spring 2004), which allows a high level of security against man-in-the-middle attacks even with relatively short check values.
- the SES protocol may be modified to provide for temporary access.
- the basic SES protocol only allows users to add devices permanently into the wireless network. However, it would be an improvement to also allow temporary access, e.g., for visitors, hotel guests, etc.
- the user can give her temporary access to the network, for example, by performing an ADD_VISITOR_OPERATION on the AP instead of pressing the normal SES button. This action starts the normal SES protocol execution and the visitor is required to press the button on her device within the predetermined amount of time, e.g., two minutes. If the SES negotiation is successful, the AP will remember this client as a visitor. Examples of ways that temporary access may be provided are described above.
- Temporary access may be revoked is various ways.
- she wants remove all the visitors from the network, she can perform a REMOVE JVISITORSJDPERATION on the AP.
- the AP will send a new WPA key to all other clients belonging to the network, and visitors will not receive this new key. Removal of less than all visitors may be accomplished as described above.
- mappings may be used without departing from the scope of the invention.
- the various buttons described below e.g., the "SES” and “Visitor” buttons
- the various buttons described below may be located directly on the AP and/or on another control device operatively coupled to the AP (e.g., by a wireless connection, a remote controller, etc.), for use, for example, in the event that the AP is located in a remote or hard to reach location.
- Table 3 shows examples of possible mappings of device operations to various user actions.
- the ADD_VISITOR_OPERATION and REMOVE_VISITORS_OPERATION provide useful extensions to the SES protocol. Without these the user cannot add visitor devices and/or she has re-configure the entire network once the user leaves the network.
- One or more aspects of the invention may be embodied in computer-executable instructions, such as in one or more program modules, executed by one or more computers or other devices.
- program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types when executed by a processor in a computer or other device.
- the computer executable instructions may be stored on a computer readable medium such as a hard disk, optical disk, removable storage media, solid state memory, RAM, etc.
- the functionality of the program modules may be combined or distributed as desired in various embodiments.
- the functionality may be embodied in whole or in part in firmware or hardware equivalents such as integrated circuits, field programmable gate arrays (FPGA), and the like.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2006800147103A CN101167305B (en) | 2005-04-04 | 2006-03-30 | Access management in a wireless local area network |
BRPI0609971-8A BRPI0609971B1 (en) | 2005-04-04 | 2006-03-30 | METHOD FOR MANAGING ACCESS TO A WIRELESS THROUGH A TERMINAL DEVICE AND ACCESS CONTROL DEVICE |
EP06744459.6A EP1875659B1 (en) | 2005-04-04 | 2006-03-30 | Administration of wireless local area networks |
JP2008503609A JP5005674B2 (en) | 2005-04-04 | 2006-03-30 | Wireless local area network administration |
ZA2007/08722A ZA200708722B (en) | 2005-04-04 | 2007-10-12 | Administration of wireless local area networks |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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US66766105P | 2005-04-04 | 2005-04-04 | |
US60/667,661 | 2005-04-04 | ||
US67380605P | 2005-04-22 | 2005-04-22 | |
US60/673,806 | 2005-04-22 | ||
US11/169,328 US8532304B2 (en) | 2005-04-04 | 2005-06-29 | Administration of wireless local area networks |
US11/169,328 | 2005-06-29 |
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WO2006106393A2 true WO2006106393A2 (en) | 2006-10-12 |
WO2006106393A3 WO2006106393A3 (en) | 2006-11-16 |
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PCT/IB2006/000695 WO2006106393A2 (en) | 2005-04-04 | 2006-03-30 | Access management in a wireless local area network |
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US (1) | US8532304B2 (en) |
EP (1) | EP1875659B1 (en) |
JP (1) | JP5005674B2 (en) |
KR (1) | KR100996872B1 (en) |
CN (1) | CN101167305B (en) |
BR (1) | BRPI0609971B1 (en) |
WO (1) | WO2006106393A2 (en) |
ZA (1) | ZA200708722B (en) |
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Also Published As
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KR100996872B1 (en) | 2010-11-26 |
JP5005674B2 (en) | 2012-08-22 |
WO2006106393A3 (en) | 2006-11-16 |
CN101167305A (en) | 2008-04-23 |
EP1875659A2 (en) | 2008-01-09 |
BRPI0609971B1 (en) | 2019-03-06 |
EP1875659B1 (en) | 2020-04-22 |
KR20070116151A (en) | 2007-12-06 |
ZA200708722B (en) | 2008-10-29 |
US8532304B2 (en) | 2013-09-10 |
JP2008537381A (en) | 2008-09-11 |
BRPI0609971A2 (en) | 2011-10-11 |
CN101167305B (en) | 2011-11-30 |
EP1875659A4 (en) | 2012-05-02 |
US20060251256A1 (en) | 2006-11-09 |
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