2026-05-28T13:47:42Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/383482026-02-03T11:24:14Zcom_10630_2254col_10630_37953

00925njm 22002777a 4500 dc Morales Escalera, Daniel author Agudo-Ruiz, Isaac author López-Muñoz, Francisco Javier author 2025-03-26 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. 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 https://hdl.handle.net/10630/38348 10.1109/JIOT.2025.3555026 Derecho a la intimidad Internet de los objetos Protocolos de comunicaciones A Lightweight Mechanism for Dynamic Secret Sharing of Private Data by Constrained Devices