<sc>Prism</sc> <underline>Pr</underline>ivacy-Preserving and Ver<underline>i</underline>fiable <underline>S</underline>et Computation over <underline>M</underline>ulti-Owner Secret Shared Outsourced Databases

Shantanu Sharma, Yin Li, Sharad Mehrotra, Nisha Panwar, Peeyush Gupta, Dhrubajyoti Ghosh

Research output: Contribution to journalArticlepeer-review


Private set computation over multi-owner databases is an important problem with many applications &#x2014; the most well studied of which is private set intersection (PSI). This paper proposes <sc>Prism</sc>, a secret-sharing based approach to compute private set operations (<italic>i.e.</italic>, intersection and union, as well as aggregates such as count, sum, average, maximum, minimum, and median) over outsourced databases belonging to multiple owners. <sc>Prism</sc> enables data owners to pre-load the data onto non-colluding servers and exploits the additive and multiplicative properties of secret-shares to compute the above-listed operations. <sc>Prism</sc> takes (at most) two rounds of communication between non-colluding servers (storing the secret-shares) and the querier for executing the above-mentioned operations, resulting in a very efficient implementation. <sc>Prism</sc> also supports result verification techniques for each operation to detect malicious adversaries. Experimental results show that <sc>Prism</sc> scales both in terms of the number of data owners and database sizes, to which prior approaches do not scale.

Original languageEnglish (US)
Pages (from-to)1-18
Number of pages18
JournalIEEE Transactions on Dependable and Secure Computing
StateAccepted/In press - 2023

All Science Journal Classification (ASJC) codes

  • General Computer Science
  • Electrical and Electronic Engineering


  • Additive sharing
  • Additives
  • Cancer
  • Costs
  • Databases
  • Heart
  • Hospitals
  • Servers
  • Shamir's secret-sharing
  • aggregation operation
  • computation and data privacy
  • data and computation outsourcing
  • multi-party computation
  • private set intersection
  • private set union
  • result verification
  • set cardinality


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