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Securing Wireless Mesh Networks. Authors: Naouel Ben Salem and Jean-Pierre Hubaux. Presentation By : Stacey Askey Vinay Jude Pavan Pujar. What are Wireless Mesh Networks. Similar to Wi-Fi Networks

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securing wireless mesh networks

Securing Wireless Mesh Networks

Authors: Naouel Ben Salem and Jean-Pierre Hubaux.

Presentation By :

Stacey Askey

Vinay Jude

Pavan Pujar

what are wireless mesh networks
What areWireless Mesh Networks
  • Similar to Wi-Fi Networks
    • Instead of multiple wireless hotspots (WHSs), WMNs use one WHS and several transit access points (TAPs).
  • Clients connect to TAPs, which connect wirelessly to the WHS either directly or multihopping over other TAPs.
slide3
WMNs
  • TAPs take place of routers, but decisions need to be made about which capabilities need to be provided on each TAP and which only the WHS needs to provide.
    • User/TAP authentication
    • Message Integrity
    • Encryption
  • WMNs provide “fast, easy and inexpensive network deployment”.
advantages disadvantages of wmns
Advantages/Disadvantages of WMNs

Advantages-

  • The TAPs themselves are cheaper than WHSs.
  • Since TAPs communicate by wireless signals, they do not require cabling to be run to add new TAPs.
    • Allows for rapid deployment of temporary networks.

Disadvantages-

  • TAPs are often placed in physically unprotected locations
    • Lack of security guarantees.
    • Communications are wireless and therefore susceptible to all the vulnerabilities of wireless transmissions.
three security challenges posed by wmn s
Three Security Challenges Posed by WMNs
  • Securing the Routing Mechanism
    • WMNs rely on multi-hop transmissions over a predominantly wireless network; the routing protocol is very important and a tempting target.
  • Detection of Corrupt TAPs
    • The TAPs are likely to be stored in unprotected locations, so they may be easily accessed by malicious entities and can be corrupted or stolen.
  • Providing Fairness
    • The protocol needs to be designed to distribute bandwidth between the TAPs in a manner fair to the users to prevent bandwidth starvation of devices far from the WHS.
fairness
Fairness
  • There are several ways in which bandwidth can be distributed among TAPs
    • What may be the best solution is to distribute bandwidth proportional to the number of clients using a TAP.
corrupt tap s
Corrupt TAPs
  • Wireless Mesh Networks use low cost devices.
  • Cannot be protected against Removal, Tampering or Replication.
  • Damage caused by Physical Tampering or Remote Access.
  • WHS has important cryptographic data and the assumption is that it is protected.
the four attacks
The Four Attacks
  • Four main types of attacks are possible.
  • The first attack is removal and replacement of the device.
  • This attack is detected by WHS or neighbor TAP because of change in topologyof the network.
access internal state
Access Internal State
  • The second type of attack is to access the internal state of the device .
  • This type of attack is a passive attack and is difficult to detect.
  • In this attack the attacker need not disconnect the device from WMN.
  • Even the disconnection cannot be detected.
  • The effect of the attack can be reduced by changing the TAP data at regular intervals.
modify internal state
Modify Internal State
  • The third type of attack is where the attacker modifies the internal state of the TAP.
  • In this type of attack, the attacker can modify the routing algorithm.
  • This type attack also changes the topology.
  • It can also be detected by WHS.
clone tap
Clone TAP
  • The fourth type of attack is of cloning the TAP.
  • In this type of attack the attacker is able to create a replica of the TAP and place this in a strategic location in WMN.
  • It also allows the attacker to inject some false data or to disconnect some parts of network.
  • It can damage the routing mechanisms but can be detected.
jamming and counter measure
Jamming and Counter-Measure
  • The first diagram shows the attack by the adversary.
  • The second diagram shows the protection measure for this attack after detection.
attacks on multihop routing in wmn
Attacks on Multihop Routing in WMN
  • Rational Attack vs Malicious Attack.
  • A Rational Attack involves misbehaving in terms of Price and QoS.
  • For instance, the routes between WHS and TAPs are artificially increased.
  • A malicious attack involves partitioning the network or isolating the TAPs.
  • Network Traffic is routed through a compromised TAP.
securing multihop routing
Securing Multihop Routing
  • Using Secure Routing Protocols to prevent attacks against routing messages.
  • If the state of one or more TAPs is modified , the attack can be detected and the network is reconfigured.
  • DoS attacks can be prevented by identifying the source of disturbance and disabling it.
generalized wmns
Generalized WMNs
  • Vehicular Networks is special case of WMNs where TAPs are represented by cars and roadside WHSs.
  • Involves applications such as reporting events(accidents),cooperative driving, payment services and location based services.
  • Multi-Operator WMNs include several operators and various devices: mobile phones, laptops, base stations and APs.
conclusion
Conclusion
  • WMNs extend the coverage of WHSs in an inexpensive manner.
  • The three fundamental security issues that have to be addressed in WMNs are:
    • Detection of corrupt TAPs.
    • Defining and using a secure routing protocol.
    • Defining and implementing a proper fairness metric.
reference
Reference
  • Mesh Networks Security Ben Salem, N.; Hubaux, J-P, "Securing wireless mesh networks ,“ Wireless Communications, IEEE, vol.13, no.2, pp.50,55, April 2006. 
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