Results 101 to 110 of about 83,946 (258)

Experimental unconditionally secure covert communication in dense wavelength-division multiplexing networks

, 2017
Covert communication offers a method to transmit messages in such a way that it is not possible to detect that the communication is happening at all. In this work, we report an experimental demonstration of covert communication that is provably secure ...
Arrazola, Juan Miguel, Li, Hao, Liu, Wen-Zhao, Liu, Yang, Pan, Jian-Wei, Primaatmaja, Ignatius William, Scarani, Valerio, Wang, Zhen, You, Lixing, Zhang, Qiang, Zhang, Weijun   +10 more
core  

Hydrogel‐Based Functional Materials: Classifications, Properties, and Applications

Advanced Materials Technologies, EarlyView.
Conductive hydrogels have emerged as promising materials for smart wearable devices due to their outstanding flexibility, multifunctionality, and biocompatibility. This review systematically summarizes recent progress in their design strategies, focusing on monomer systems and conductive components, and highlights key multifunctional properties such as
Zeyu Zhang, Zao Cheng, Patrizio Raffa
wiley   +1 more source

Covert Binary Communications through the Application of Chaos Theory: Three Novel Approaches [PDF]

Journal of Systemics, Cybernetics and Informatics, 2008
Today, most covert communications systems use a spreadspectrum approach to ensure that transmissions remain clandestine. This paper expands beyond traditional spreadspectrum schemes and into chaos theory in communications by presenting a novel design for
Kyle J. Bradbury, Joseph P. Noonan
doaj  

Advances in Safe, Flexible, and Stretchable Batteries for Wearable Applications

Advanced Materials Technologies, EarlyView.
Unlike previous reviews centered on component‐based deformability, this work highlights safety‐driven design strategies for flexible and stretchable batteries. By integrating material‐level engineering, geometry‐controlled structures, biocompatibility, and self‐protection mechanisms, it establishes a unified framework that connects mechanical ...
Hyewon Kang, Garan Byun, Seunghyeb Ban, Yunuo Huang, Woon‐Hong Yeo   +4 more
wiley   +1 more source

Another Step in the Ladder of DNS-Based Covert Channels: Hiding Ill-Disposed Information in DNSKEY RRs

Information, 2019
Covert channel communications are of vital importance for the ill-motivated purposes of cyber-crooks. Through these channels, they are capable of communicating in a stealthy way, unnoticed by the defenders and bypassing the security mechanisms of ...
Marios Anagnostopoulos, John André Seem   +1 more
doaj   +1 more source

Community Covert Communication - Dynamic Mass Covert Communication Through Social Media

22 pages, 8 figures, this work has been presented at 44CON 2024 & 44CON 2025 in ...
openaire   +2 more sources

Covert Communication Over Additive-Noise Channels

IEEE Transactions on Information Theory
We study the fundamental limits of covert communications over general memoryless additive-noise channels. We assume that the legitimate receiver and the eavesdropper share the same channel and therefore see the same outputs. Under mild integrability assumptions, we find a general upper bound on the square-root scaling constant, which only involves the ...
Cécile Bouette, Laura Luzzi, Ligong Wang   +2 more
openaire   +4 more sources

Unveiling Ultrafast Spin‐Valley Dynamics and Phonon‐Mediated Charge Transfer in MoSe2/WSe2 Heterostructures

Advanced Optical Materials, Volume 13, Issue 8, March 13, 2025.
This study reveals the potential to manipulate spin‐valley polarization dynamics in MoSe2/WSe2 heterostructures by quantifying different scattering processes following selective photoexcitation. The results show that these heterostructures enable ultrafast valley‐selective charge transfer, with phonon scattering playing a significant role in the ...
Julian Wagner, Robin Bernhardt, Lukas Rieland, Omar Abdul‐Aziz, Qiuyang Li, Xiaoyang Zhu, Stefano Dal Conte, Giulio Cerullo, Paul H. M. van Loosdrecht, Hamoon Hedayat   +9 more
wiley   +1 more source

Detecting covert channel attacks on cyber‐physical systems

IET Cyber-Physical Systems
Cyberattacks on cyber‐physical systems (CPS) have the potential to cause widespread disruption and affect the safety of millions of people. Machine learning can be an effective tool for detecting attacks on CPS, including the most stealthy types of ...
Hongwei Li, Danai Chasaki
doaj   +1 more source

Mode‐dependent Far‐field Radiation of Circularly Polarized Light by a Single Plasmonic Nanohelix

Advanced Optical Materials, Volume 13, Issue 8, March 13, 2025.
The numerical simulations explored the chiroptical response and far‐field radiation behaviors of single plasmonic nanoantennas transitioning into helical structures. This study highlights the ability of these plasmonic nanohelices to regulate the far‐field directionality of radiation power and circular polarization in plasmon‐exciton coupled systems ...
Yiou Cui, Yilin Chen, Jing Li, Shengyan Wang, Ruiqian Zhang, Zhongyi Chen, Huan Liu, Ximin Cui, Xihang Shi, Biye Xie, Xiaolu Zhuo   +10 more
wiley   +1 more source