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Balancing Centralization and Decentralization in Cloud Data Management

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The paper explores the risks associated with cloud storage, including centralization of personal identifiable information (PII), loss of assets, and potential identity theft. It contrasts these issues with a decentralized approach, highlighting the complexities and management challenges of such systems. The author proposes a compromise between extreme centralization and decentralization through a hybrid model that emphasizes data encryption, privacy-preserving advertising, and the necessary use of small, manageable data droplets. A unified API at both centralized and decentralized levels is suggested for improved resilience and privacy.

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Balancing Centralization and Decentralization in Cloud Data Management

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  1. Droplets:- Condensing the Cloud Jon Crowcroft, http://www.cl.cam.ac.uk/~jac22

  2. From the Cloud… • The cloud has its risks…

  3. Centralisation of PII • What if • Provider goes broke • Lose all your family photos • Assets sold to another (unknown) provider • In a large organisation, • There will always be someone bad • Who can datamine • Identity theft • And worse

  4. To Droplets • At the other extreme…

  5. A fully decentralised approach… • Can obviate cloud risks • But introduces complexity • Management overhead (p2p/manet/dtn) • Availability/resilience • Total data loss if device stolen • Can we compromise • Between extreme centralisation… • And extreme decentralisation?

  6. Via extraction • Firstly, we need to pull/push data • From/to the cloud…

  7. …and condensation

  8. Replication/Decentralisation are necessary, but not sufficient… • Need to encrypt data • Both in Cloud • And in Mist • The mist is a collection of droplets - • small objects with key/capability • and auditor • What about cloud business models? • Use privacy preserving advertising (MPI) • Use k-anonymity and threshold security • Use differential privacy for market research

  9. Implementation Details

  10. To Conclude… • Use contributed resources are fine • Home hub, phone, etc • But need to unify with cloud • Do so at API level • Have both decentralised and central • Advantages of both • Low latency access to home/pocket • High resilience in cloud • No loss of privacy if bad cloud/pick pocket

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