Improving Hard Disk Contention-based Covert Channel in Cloud Computing Environment

NVBleed: 针对NVIDIA多GPU互连的隐蔽信道与侧信道攻击

NVBleed: Covert and Side-Channel Attacks on NVIDIA Multi-GPU Interconnect

本研究逆向分析NVIDIA NVLink互连的两类泄漏源，实现跨GPU隐蔽信道与侧信道攻击，验证云端跨虚拟机泄漏风险，并提出相应防御思路。

TorKameleon：通过 K-anonymization 和基于媒体的隐蔽通道改善 Tor 的抗审查性

TorKameleon: Improving Tor's Censorship Resistance with K-anonymization and Media-based Covert Channels

TorKameleon通过K-anonymization技术分片重路由流量并利用WebRTC隐蔽通道或TLS隧道封装，保护Tor用户免受被动与主动关联攻击，提升抗审查性。

利用局部敏感哈希改进现实世界恶意软件的DNS隐蔽通道识别

Improving the Identification of Real-world Malware's DNS Covert Channels Using Locality Sensitive Hashing

本文提出利用局部敏感哈希改进恶意软件DNS隐蔽通道识别，通过统计相似性特征和随机森林分类器提升检测准确性和鲁棒性。

Spy in the GPU-box: Covert and Side Channel Attacks on Multi-GPU Systems

The deep learning revolution has been enabled in large part by GPUs, and more recently accelerators, which make it possible to carry out computationally demanding training and inference in acceptable times. As the size of machine learning networks and workloads continues to increase, multi-GPU machines have emerged as an important platform offered on High Performance Computing and cloud data centers. As these machines are shared between multiple users, it becomes increasingly important to protect applications against potential attacks. In this paper, we explore the vulnerability of Nvidia's DG…

Lord of the Ring(s): Side Channel Attacks on the CPU On-Chip Ring Interconnect Are Practical

We introduce the first microarchitectural side channel attacks that leverage contention on the CPU ring interconnect. There are two challenges that make it uniquely difficult to exploit this channel. First, little is known about the ring interconnect's functioning and architecture. Second, information that can be learned by an attacker through ring contention is noisy by nature and has coarse spatial granularity. To address the first challenge, we perform a thorough reverse engineering of the sophisticated protocols that handle communication on the ring interconnect. With this knowledge, we bu…

Countering Adaptive Network Covert Communication with Dynamic Wardens

Network covert channels are hidden communication channels in computer networks. They influence several factors of the cybersecurity economy. For instance, by improving the stealthiness of botnet communications, they aid and preserve the value of darknet botnet sales. Covert channels can also be used to secretly exfiltrate confidential data out of organizations, potentially resulting in loss of market/research advantage. Considering the above, efforts are needed to develop effective countermeasures against such threats. Thus in this paper, based on the introduced novel warden taxonomy, we prese…

Intelligent Reflecting Surface for Wireless Communication Security and Privacy

Intelligent reflection surface (IRS) is emerging as a promising technique for future wireless communications. Considering its excellent capability in customizing the channel conditions via energy-focusing and energy-nulling, it is an ideal technique for enhancing wireless communication security and privacy, through the theories of physical layer security and covert communications, respectively. In this article, we first present some results on applying IRS to improve the average secrecy rate in wiretap channels, to enable perfect communication covertness, and to deliberately create extra rando…