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Practically Efficient Private Set Intersection from Trusted Hardware with Side-Channels

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Advances in Cryptology – ASIACRYPT 2023 (ASIACRYPT 2023)

Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 14441))

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Abstract

Private set intersection (PSI) is one of the most important privacy-enhancing technologies with applications such as malware and spam detection, recognition of child pornography, contact discovery, or, more recently, contact tracing. In this paper, we investigate how PSI can be constructed and implemented simply and practically efficient. To this end, a natural possibility is the use of trusted execution environments (TEEs), which are commonly used in place of a trusted third party due to their presumed security guarantees. However, this trust is often not warranted: Today’s TEEs like Intel SGX suffer from a number of side-channels that allow the host to learn secrets of a TEE, unless countermeasures are taken. Furthermore, due to the high complexity and closed-source nature, it cannot be ruled out that a TEE is passively corrupted, i.e. leaks secrets to the manufacturer or a government agency such as the NSA. When constructing a protocol using TEEs, such (potential) vulnerabilities need to be accounted for. Otherwise, all security may be lost.

We propose a protocol for two-party PSI whose security holds in a setting where TEEs cannot be fully trusted, e.g. due to the existence of side-channels. In particular, we deal with the possibilities that i) the TEE is completely transparent for the host, except for very simple secure cryptographic operations or ii) that it leaks all secrets to a third party, e.g. the manufacturer. Even in this challenging setting, our protocol is not only very fast, but also conceptually simple, which is an important feature as more complex protocols tend to be implemented with subtle security faults.

To formally capture this setting, we define variants of the ideal functionality for TEEs due to Pass et al. (EUROCRYPT 2017). Using these functionalities, we prove our protocol’s security, which holds under universal composition. To illustrate the usefulness of our model, we sketch other possible applications like (randomized) oblivious transfer or private computation of the Hamming distance.

Our PSI implementation, which uses Intel SGX as TEE, computes the intersection between two sets with \(2^{24}\) 128-bit elements in 7.3 s. This makes our protocol the fastest PSI protocol to date with respect to single-threaded performance.

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Notes

  1. 1.

    While this can be prevented in principle by using appropriate building blocks (e.g. by obtaining an independent key for the hash function using a coin-toss build from a non-malleable commitment scheme), we are not aware that this is done in practice.

  2. 2.

    Depending on the model considered, this approach may not yield provable security for technical reasons. For example the model of [39] provably requires two TEEs for any two-party functionality. However, as this is outside the scope of our paper, we will not further discuss it and refer the interested reader to [39].

  3. 3.

    In \(\mathcal {F}_\textrm{oPSI}\) and \(\pi _{\textrm{oPSI}}\), we assume that \(\ell = \kappa \). However, this can be easily generalized.

  4. 4.

    For the code, see https://github.com/kastel-security/psi-with-sgx.

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Acknowledgements

This work was supported by KASTEL Security Research Labs.

Felix Dörre: This work was supported by funding by the German Federal Ministry of Education and Research (BMBF) under the project “VE-ASCOT” (ID 16ME0275). Jeremias Mechler, Jörn Müller-Quade: This work was supported by funding from the topic Engineering Secure Systems of the Helmholtz Association (HGF).

We would like to thank Anastasia Zinkina for providing valuable feedback and laying the foundation for this work in her master’s thesis [49]. We would also like to thank the anonymous referees for their valuable and very detailed feedback.

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  1. KASTEL Security Research Labs, Karlsruhe Institute of Technology, Karlsruhe, Germany

    Felix Dörre, Jeremias Mechler & Jörn Müller-Quade

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  1. Felix Dörre
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Correspondence to Jeremias Mechler .

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  1. Nanyang Technological University, Singapore, Singapore

    Jian Guo

  2. Monash University, Melbourne, VIC, Australia

    Ron Steinfeld

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Dörre, F., Mechler, J., Müller-Quade, J. (2023). Practically Efficient Private Set Intersection from Trusted Hardware with Side-Channels. In: Guo, J., Steinfeld, R. (eds) Advances in Cryptology – ASIACRYPT 2023. ASIACRYPT 2023. Lecture Notes in Computer Science, vol 14441. Springer, Singapore. https://doi.org/10.1007/978-981-99-8730-6_9

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