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A Lightweight Mechanism for Dynamic Secret Sharing of Private Data by Constrained Devices

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Název: A Lightweight Mechanism for Dynamic Secret Sharing of Private Data by Constrained Devices
Autoři: Daniel Morales, Isaac Agudo, Javier Lopez
Zdroj: RIUMA. Repositorio Institucional de la Universidad de Málaga
Universidad de Málaga
Informace o vydavateli: Institute of Electrical and Electronics Engineers (IEEE), 2025.
Rok vydání: 2025
Témata: Privacy, Secret Sharing, Derecho a la intimidad, Internet of Things, Internet de los objetos, Secure Multi-Party Computation, Protocolos de comunicaciones
Popis: Outsourced computations are essential for IoT devices, but they can raise privacy issues. Privacy-preserving technologies, such as Secure Multi-Party Computation, can be used to delegate computations on private data from multiple devices while disclosing nothing but the output, but they may come at a prohibitive cost. In particular, Secret Sharing-based Secure Multi-Party Computation requires the device to establish n independent confidential channels for each shared message, one channel per holder. This work proposes a new approach for IoT devices to secretly share private data with a committee of holders by broadcasting a single ciphertext. A straightforward solution is Homomorphic Encryption with Decryption to Shares from Chillotti et al., 2022, but it requires Fully Homomorphic Encryption and is not dynamic. Additionally, we propose Oblivious Sharing Re-Encryption, which is a new family of protocols that achieve this lightweight private data sharing without requiring Fully Homomorphic Encryption, and which is also more dynamic. We provide a concrete implementation based on NTRU encryption, together with a security proof and performance analysis. The analysis shows that OSRE outperforms the standard setting with n confidential channels when the device sends more than one message.
Funding for open access publishing: Universidad de Málaga/CBUA.
Druh dokumentu: Article
ISSN: 2372-2541
DOI: 10.1109/jiot.2025.3555026
Přístupová URL adresa: https://hdl.handle.net/10630/38348
Rights: CC BY
Přístupové číslo: edsair.doi.dedup.....d7a993cca6b8e4ba53617b99defff766
Databáze: OpenAIRE
Popis
Abstrakt:Outsourced computations are essential for IoT devices, but they can raise privacy issues. Privacy-preserving technologies, such as Secure Multi-Party Computation, can be used to delegate computations on private data from multiple devices while disclosing nothing but the output, but they may come at a prohibitive cost. In particular, Secret Sharing-based Secure Multi-Party Computation requires the device to establish n independent confidential channels for each shared message, one channel per holder. This work proposes a new approach for IoT devices to secretly share private data with a committee of holders by broadcasting a single ciphertext. A straightforward solution is Homomorphic Encryption with Decryption to Shares from Chillotti et al., 2022, but it requires Fully Homomorphic Encryption and is not dynamic. Additionally, we propose Oblivious Sharing Re-Encryption, which is a new family of protocols that achieve this lightweight private data sharing without requiring Fully Homomorphic Encryption, and which is also more dynamic. We provide a concrete implementation based on NTRU encryption, together with a security proof and performance analysis. The analysis shows that OSRE outperforms the standard setting with n confidential channels when the device sends more than one message.<br />Funding for open access publishing: Universidad de Málaga/CBUA.
ISSN:23722541
DOI:10.1109/jiot.2025.3555026