Security in Mobile Networks

Security in Mobile Peer To Peer Networks

Group 9
Erik Andersson Mohammad Umer Zia Amir Tirdad

Chalmers University of Technology

Security in Mobile Peer To Peer Networks

Introduction A network that allows two wireless devices to communicate with the help of other wireless devices that lie within range of each other. Challenges Lack of resources The absence of a central node High mobility Different devices and platforms Leads to Key distribution problem Coping with attacks What model to use

Chalmers University of Technology

Security in Mobile Peer To Peer Networks

Self organized networks
Initialization Expansion Mechanism
Secure side channel - Short distance - Line of sight required - Integrity should be there - Confidentiality not required

Chalmers University of Technology

Security in Mobile Peer To Peer Networks

Expansion Mechanism or Friends mechanism (Based on one hop trust) Eric and Umer are friends • They have established a Security Association at initialisation • They faithfully share with each other the Security Associations they have set up with other users

Chalmers University of Technology

Security in Mobile Peer To Peer Networks

a) Activation of Secure Side Channel

i

j

i

j

f

f

b) Mutual friend i f j i f j

c) One hop Friend i j i j

i

j

Secure side Channel Already have Two way SA Established friends( know each other keys) One hop friend

Security in Mobile Peer To Peer Networks

Chalmers University of Technology

Security in Mobile Peer To Peer Networks

Transitivity of Trust

Chalmers University of Technology

Security in Mobile Peer To Peer Networks Speed of security associations establishment
Depends upon
Area size Number of nodes Number of friends Mobility model

Convergence :

∑ r (t ) =
Chalmers University of Technology

i , j ij

e (t ) ⋅ pi j ij ∑

pij

This r(t) is the earliest time at which r(t) = 1

Security in Mobile Peer To Peer