Un peu de recherche

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Un peu de recherche
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LIRIS/DCS/DRIM
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Nostalgia an overview of the past10 years

• Some contributions to the management of data in
  grids
• Some contributions to Pervasive/Ubiquitous
  Systems and other distributed systems (incl.
  security and privacy)

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Some contributions to the management of data in
grids
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Computing/Data Grid (1)

• coordinated resource sharing and problem
  solving in dynamic, multi-institutional virtual
  organisations (I. Foster)

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Computing/Data Grids (2)

• Large scale
• Unpredictability, dynamicity
• Security, privacy
• Resource heterogeneity and usage diversity
• Decentralized administration

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Monitoring de grilles

• Where to place instances (replicas) of a service?
• What resource (set of resources) (what service)
  use?
• Condition monitor the grid state CPU load,
  network load
• Design and implementation of a grid service that
  processes high-level information requests that
  represent the users specific needs in terms of
  resources

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NDS Network Distance Service
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Grid access control Sygn

• Permission Authorization Certificate (AC)
• Issuer
• Owner
• Capability (access control object authorized
  action)
• Validity
• Signature

Mechanisms for delegation of rights File group
operations
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Encrypted Storage for Data Grids Crypstore
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Management of a Cooperative Cache in Grids

• Monitoring operations
• data description
• processed requests
• transfers
• replacements
• used storage resource
• Etc.
• Management operations
• Set replacement method
• Set default time to live
• Set cache group
• Set cache coordinator
• Set collective work mode
• Etc.

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Data Integration
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Some Contributions to Pervasive/Ubiquitous
Systems and Other Distributed Systems (incl.
Security and Privacy)
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Pervasive, Ubiquitous, Mobile, Ambient, Ad Hoc ?

• Introduction to pervasive systems
• Hansel and Gretel are lost in the forest of PC
  definitions
• Basics (1)
• Mobility (wireless) / autonomy
• User (or device)-centric
• Context-awareness (user prefs, environment)
• Basics (2)
• Lightweight appliances and devices
• Proactivity
• ? Make the digital world/information omnipresent
  but invisible

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PerSE

• Context-Awareness
• Proactivity
• Service Composition

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Architecture of a PerSE Base
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PerSE Layers
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Context Modeling and Context-Aware Pervasive
Applications

• Context ?
• User/Application centric context
• Context-aware application platform

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Access Control of Mobile Users

• Chains of trust certificates if A trusts B and B
  trusts C then A trusts C to some level
• Multi-layered adaptive certificates
• Trust computing and reputation

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Privacy-Preserving Reputation Systems

• Reputation aggregation of feedbacks
• Query agent, target agent, source agents
• Goal computing the reputation while not
  revealing the individual feedbacks
• Approach use trust relations in the reputation
  protocol for enforce the privacy cut
  feedbacks into pieces (shares) use
  cryptographic tools

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Authentication and Trust in Pervasive Systems
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Mobile Requests

• Information exchange between mobile peers
  (MANETs, VANETs)
• Trajectory aware geocast request routing
• Construction for each query of an ad hoc overlay
  of the peers that may participate to the delivery
  of the requested data

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Data Replication in Small Worlds
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Replication in Ad Hoc Networks

• Issues instability, dynamicity,
  faults/disconnections
• Basic idea adapt the replication heuristics to
  the actual usage of the data, e.g.
• Data highly accessed gt replicate
• Rare data and planned disconnection gt replicate
• Overloaded peer gt replicate most accessed data
• Etc.
• Pre-requisite access logging exchange of
  access data
• Assumption no central coordination local
  decisions
• Question can local decisions lead to an
  acceptable (good ?) situation ?

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Interface Adaptation and Context-Aware Browsing
of a Patient Medical Record
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Multimedia Content Adaptation
Adaptation of the interface wrt the end-user
device Ongoing Content Adaptation in MANETs
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Semantic Protection of Multimedia Data

• Multimedia gt access control is not a binary
  decision
• Access control ltgt content adaptation
• Coherence/Consistence of an adaptation
• Legality of an adaptation
• gt Access control semantic adaptation decision

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Semantic Clustering of Multimedia Queries From
Query Logging to Database Content and User
Profile Discovery

• Large number of data stores disseminated
• Lack of indexes
• Issues
• What are the pertinent/interesting data ?
• What are the users interest ?
• How to process a query ?
• Logging of the users queries clustering
  communication of clustering info gt
  identification of the community of users
  interests
• Logging of a the queries issued by a specific
  user matching to the community clustering gt
  identification of the users profile
• Usage query optimization, data store management,
  recommendation, social computing, etc.

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BAR-Tolerant Publish-subscribe P2P
SystemsCollaboration Modeling and Enhancing a
Game Theoretical Approach

• Byzantine-Altruistic-Rational
• Publish an information disseminate the
  information to subscribers
• Systems benchmarking tool
• GT modeling of collaborative systems

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Ambient Social Networks andMessage Routing in DTN

• Ambient social networks
• Delay Tolerant Networks (DTN) and Opportunistic
  Networks
• Mobility traces/model
• Message routing

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Ongoing workUser-centric Ubiquitous
Multi-ScaleDigital Ecosystems

• Information retrieval in P2P systems
• Privacy-preserving personal data mining (EEXCESS
  project)
• Privacy-preserving recommendation systems
  (EEXCESS project)
• Privacy-preserving multimedia data routing
• Open data and user-as-sensor based ambient social
  services
• Game-theory-based cooperation modeling and
  enhancing in distributed systems
• Trust and reputation in B2B networks
  (AttestationLegale)
• Information protection in clouds
• Social-aware event driven architectures
• Mobile Crowd Sourcing, Sensing, and Computing
  Intelligence, Aggregation, Resilience
• (if opportunity) Adaptive and information
  value-based protection of business processes
• (if opportunity) Security of the social web of
  things
• ???

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• Faites de la recherche
• (au moins un peu)
• ? !