S2Net: Preserving Privacy in Smart Home Routers

Seung Seob Lee, Hang Shi, Kun Tan, Yunxin Liu, Su Kyoung Lee, Yong Cui

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


At present, wireless home routers are becoming increasingly smart. While these smart routers provide rich functionalities to users, they also raise security concerns. Although the existing end-to-end encryption techniques can be applied to protect personal data, such rich functionalities become unavailable due to the encrypted payloads. On the other hand, if the smart home routers are allowed to process and store the personal data of users, once compromised, the users' sensitive data will be exposed. As a consequence, users face a difficult trade-off between the benefits of the rich functionalities and potential privacy risks. To deal with this dilemma, we propose a novel system named Secure and Smart Network (S2Net) for home routers. For S2Net, we propose a secure OS that can distinguish and manage multiple sessions belonging to different users. The secure OS and all the router applications are placed in the secure world using the ARM TrustZone technology. In S2Net, we also confine the router applications in sandboxes provided by the proposed secure OS to prevent data leakage. As a result, S2Net can provide rich functionalities for users while preserving strong privacy for home routers. In addition, we develop a crypto-worker model that provides an abstraction layer of cryptographic tasks performed by a heterogeneous multi-core system. The other important role of crypto-worker is to parallelize the computations in order to resolve the high computation cost of cryptographic functions. We report the system design of S2Net and the details of our implementation. Experimental results with benchmarks and real applications demonstrate that our implementation is capable of achieving high performance in terms of throughput while mitigating the overhead of S2Net design.

Original languageEnglish
Article number8744305
Pages (from-to)1409-1424
Number of pages16
JournalIEEE Transactions on Dependable and Secure Computing
Issue number3
Publication statusPublished - 2021 May 1

Bibliographical note

Funding Information:
This work was partially performed while Seung-seob Lee and Hang Shi were research interns at Microsoft Research Asia. This work has been supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2017R1A2B4002000).

Publisher Copyright:
© 2004-2012 IEEE.

All Science Journal Classification (ASJC) codes

  • Computer Science(all)
  • Electrical and Electronic Engineering


Dive into the research topics of 'S2Net: Preserving Privacy in Smart Home Routers'. Together they form a unique fingerprint.

Cite this