Google Introduces New Open-Source Data Privacy Protocol — Private Set Membership (PSM)

guest · Nov 1, 2021

Google Introduces New Open-Source Data Privacy Protocol
November 1, 2021
https://www.securityweek.com/google-introduces-new-open-source-data-privacy-protocol

The protocol helps clients check whether a specific identifier is present in a list held by a server, in a privacy-preserving manner: the client identifier is transmitted encrypted, the server doesn’t learn the result of the query, and the client doesn’t learn details on the set of identifiers on the server, other than whether the queried identifier is or isn’t a member of the set.

“As an example, users may want to check membership of a computer program on a block list consisting of known malicious software before executing the program. Often, the set’s contents and the queried items are sensitive, so we designed Private Set Membership to perform this task while preserving the privacy of our users,” Google explains.
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Starting Chrome 94, Google says, Chrome OS devices leverage the privacy-focused protocol to complete the enrollment process, which involves verifying device information with Google, such as whether it is enterprise enrolled or pre-packaged with a license.
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Private Set Membership, which is available in open source, leverages Google’s open source homomorphic encryption library to ensure that encrypted data can be operated even without decryption, as well as oblivious hashing, a cryptographic technique where two parties can jointly compute a hash while keeping each of their contributions hidden.

With Private Set Membership, Google says, devices can check allow or block lists in a privacy-preserving manner, and control flows with conditional membership checks are possible while ensuring that no data ever leaves the device.
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Google: Protecting your device information with Private Set Membership

In this post, we introduce the next iteration of our research, Private Set Membership, as well as its open-source availability. At a high level, Private Set Membership considers the scenario in which Google holds a database of items, and user devices need to contact Google to check whether a specific item is found in the database.
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Google Introduces New Open-Source Data Privacy Protocol — Private Set Membership (PSM)

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