Konrad-Felix Krentz (Uppsala University), Thiemo Voigt (Uppsala University, RISE Computer Science)

Object Security for Constrained RESTful Environments (OSCORE) is an end-to-end security solution for the Constrained Application Protocol (CoAP), which, in turn, is a lightweight application layer protocol for the Internet of things (IoT). The recently standardized Echo option allows OSCORE servers to check if a request was created recently. Previously, OSCORE only offered a counter-based replay protection, which is why delayed OSCORE requests were accepted as fresh. However, the Echo-based replay protection entails an additional round trip, thereby prolonging delays, increasing communication overhead, and deteriorating reliability. Moreover, OSCORE remains vulnerable to a denial-of-sleep attack. In this paper, we propose a version of OSCORE with a revised replay protection, namely OSCORE next-generation (OSCORE-NG). OSCORENG fixes OSCORE’s denial-of-sleep vulnerability and provides freshness guarantees that surpass those of the Echo-based replay protection, while dispensing with an additional round trip. Furthermore, in long-running sessions, OSCORE-NG incurs even less communication overhead than OSCORE’s counter-based replay protection. OSCORE-NG’s approach is to entangle timestamps in nonces. Except during synchronization, CoAP nodes truncate these timestamps in outgoing OSCORE-NG messages. Receivers fail to restore a timestamp if and only if an OSCORE-NG message is delayed by more than 7.848s in our implementation by default. In effect, older OSCORE-NG messages get rejected.

View More Papers

A Duty to Forget, a Right to be Assured?...

Hongsheng Hu (CSIRO's Data61), Shuo Wang (CSIRO's Data61), Jiamin Chang (University of New South Wales), Haonan Zhong (University of New South Wales), Ruoxi Sun (CSIRO's Data61), Shuang Hao (University of Texas at Dallas), Haojin Zhu (Shanghai Jiao Tong University), Minhui Xue (CSIRO's Data61)

Read More

DeepGo: Predictive Directed Greybox Fuzzing

Peihong Lin (National University of Defense Technology), Pengfei Wang (National University of Defense Technology), Xu Zhou (National University of Defense Technology), Wei Xie (National University of Defense Technology), Gen Zhang (National University of Defense Technology), Kai Lu (National University of Defense Technology)

Read More

You Can Use But Cannot Recognize: Preserving Visual Privacy...

Qiushi Li (Tsinghua University), Yan Zhang (Tsinghua University), Ju Ren (Tsinghua University), Qi Li (Tsinghua University), Yaoxue Zhang (Tsinghua University)

Read More

Detecting Voice Cloning Attacks via Timbre Watermarking

Chang Liu (University of Science and Technology of China), Jie Zhang (Nanyang Technological University), Tianwei Zhang (Nanyang Technological University), Xi Yang (University of Science and Technology of China), Weiming Zhang (University of Science and Technology of China), NengHai Yu (University of Science and Technology of China)

Read More