RT Journal Article
T1 A Lightweight Mechanism for Dynamic Secret Sharing of Private Data by Constrained Devices
A1 Morales Escalera, Daniel
A1 Agudo-Ruiz, Isaac
A1 López-Muñoz, Francisco Javier
K1 Derecho a la intimidad
K1 Internet de los objetos
K1 Protocolos de comunicaciones
AB 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.
PB IEEE Xplore
YR 2025
FD 2025-03-26
LK https://hdl.handle.net/10630/38348
UL https://hdl.handle.net/10630/38348
LA spa
NO D. Morales, I. Agudo and J. Lopez, "A Lightweight Mechanism for Dynamic Secret Sharing of Private Data by Constrained Devices," in IEEE Internet of Things Journal
NO Funding for open access publishing: Universidad de Málaga/CBUA.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026