Exhibition

16Internet Technology for Broadcast Services

Privacy Preserving System for Secure Integrated Broadcast-Broadband Services
Toward secure utilization of personal data

Outline

We are researching encryption technology for the purpose of implementing safe and secure integrated broadcast-broadband services for individuals. We have developed a privacy-preserving system that allows encrypted viewing histories to be searched on a cloud server without decrypting them and restricts access to authorized service providers. In this way, service providers can provide personalized services according to preferences of each viewer with high security.

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Features

An encryption scheme that supports both secure keyword search and access control
We have developed an encryption scheme that can provide an attribute-based access control for data and search for keywords in encrypted data without decrypting them. This makes it possible for service providers to acquire the bare minimum viewing history from the cloud server and to efficiently analyze preferences of viewers, thereby minimizing risk to viewer privacy.
Reducing processing load on user terminals
By outsourcing part of the encryption process to the cloud server, we can reduce processing load on user terminals so as not to affect performance of integrated broadcast-broadband services.
Ensuring high-level security
Service providers can verify whether or not the search results received from the cloud server are correct. This ensures high-level security of the system, even if the cloud server illegally modifies data stored in it.

Future plans

We will carry out research aimed at practical implementations, including the construction of large-scale databases.

  • PrivacyMark: A JIPDEC (Japan Information Processing and Development Center) certification scheme for service providers that properly handle personal information
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Privacy Preserving System for Secure Integrated Broadcast-Broadband Services Toward secure utilization of personal data

  • Privacy Preserving System for Secure Integrated Broadcast-Broadband Services
  • User terminal (viewing history)
  • Cloud server (encrypted viewing history)
  • Service provider A (search for viewing history)
  • Service provider B (search for viewing history)