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Trust Establishment in Pervasive Grid Environments

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Title: Trust Establishment in Pervasive Grid Environments


1
Trust Establishment in Pervasive Grid
Environments
  • Syed Naqvi, Michel Riguidel
  • TÉLÉCOM PARIS
  • École Nationale Supérieur des Télécommunications
    (ENST)
  • 46 Rue Barrault, Paris 75013, France
  • naqvi, riguidel_at_enst.fr

2
Outline
  • Introduction
  • Trust Establishment
  • Implementation Status
  • Conclusions

3
Outline
  • Introduction
  • Trust Establishment
  • Implementation Status
  • Conclusions

4
Trust
The reliance on a property or a virtue of a
person, or the conviction that a given premise is
true. Oxford Dictionary
An entity A is considered to trust another entity
B when entity A believes that entity B will
behave exactly as expected and required. Internat
ional Telecommunication Union
5
Pervasive Grid Environments
  • The Grid can be accessed from any networked
    device
  • laptop, mobile phone, PDA,
  • The Grid can be composed of Internet-connected
    light-weight devices
  • Inherent limitations of these devices, physical
    security,
  • Ubiquitous access to the computing and storage
    resources
  • Adaptable to users environments available
    anywhere anytime
  • Enable mobile users to launch, monitor, and steer
    applications on the Grid
  • Introduces new challenges
  • Bandwidth, heterogeneity, connectivity,
    scalability, interfacing
  • Security physical gaps requires knowledge of
    context and state

6
The Problem Statement
  • How pervasive grid nodes can trust unknown
    infrastructure with their private data and
  • How a computing infrastructure can trust a mobile
    node which is seeking access to its resources.

7
Outline
  • Introduction
  • Trust Establishment
  • Implementation Status
  • Conclusions

8
Trust Requirements
  • Identification, Access Control, Privacy,
  • User-based Trust Relationships
  • If a user has the right to use sites A and B, the
    user should be able to use sites A and B together
    without requiring the security administrators
    from sites A and B to interact.
  • Distributed Trust Evaluation
  • The decentralized nature of administration makes
    it difficult to establish and propagate trust. A
    distributed trust evaluation scheme is therefore
    required for the pervasive grid environments.
  • Non-History-based Trust Establishment
  • If there is no trust among parties and there is
    no mechanism to build some trust based on a
    history of previous interactions.

9
Trust Establishment Approach
  • Delegation of trust
  • Decentralized hierarchical administration,
    scalability of certificate issuing capacity,
  • Continuous monitoring of the changes to the trust
    level of each node
  • Dynamic evaluation of the trust relationships,
    broadcast the presence of a malicious node in the
    environment,
  • Consideration of context and state
  • Determination of the access control on the basis
    of users location and the state of the users
    environment.

10
  • Instead of having a single value representing the
    trust-worthiness of a node, the value should be
    broken into separate attributes confidences
  • Each confidence represents a characteristic of a
    node from which trust can be synthesized. For
    example
  • We can trust a node to be accurate (important for
    data integrity)
  • We can trust a node to complete task reliably
  • We can trust nodes to return data quickly (or
    always in the guaranteed time).
  • These attributes form a virtual plane to link the
    resources, users (individuals services) and the
    applications
  • Virtual and extensible basis for
    synthesizingvarying types of trust
  • Signifies that there is not a fix form of trust
    among the various entities
  • Allows the greatest flexibility from one
    entityto the other

11
  • From the functional point of view
  • Attribute certificates are used in compliment
    with identity certificates provided by the
    existing infrastructure.
  • Identity certificates are used to verify the
    identity of an entity in a highly anonymous
    environment (e.g. the internet)
  • Attribute certificates are used to determine the
    trustworthiness of an uncertain environment
    (such as Pervasive Grid)
  • For direct trust relationship within a single
    domain, a node estimates the trustworthiness of
    the node it is going to interact.
  • By using the centralized credentials architecture
    to determine the trust values of the individual
    nodes.
  • By maintaining a trust table of the domain.
  • For indirect trust relationships across multiple
    domains, a node has to trust all the
    intermediaries that it traversed before arriving
    the second node.
  • By evaluating the trust degree along the whole
    path.

12
Outline
  • Introduction
  • Trust Establishment
  • Implementation Status
  • Conclusions

13
Experimental Set-up
Exam Hall
Library
S
S
T
T
S
S
S
S
CA / Storage Display Center
14
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15
Outline
  • Introduction
  • Trust Establishment
  • Implementation Status
  • Conclusions

16
  • The computing world is moving from the desktop
    computing to the mobile and nomadic computing.
  • The near future Grid users will prefer to access
    the grid resources from their smart devices.
  • Current research efforts to address trust problem
    in a Grid environment focus on relatively static
    scenarios.
  • Pervasive Grid Environments require dynamic
    establishment of trust.
  • These pervasive Grid environments may be few
    years ahead but its important to envision how
    things will be dealt with in the future.
  • Our future directions include
  • Implementation of deeper and fine grained
    interactions among the various entities of the
    Pervasive Grid Environments.
  • Implementation of our trust model as an extension
    to the GSI.

17
(No Transcript)
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