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Infrared (IR) light is invisible to humans, but cameras are optically sensitive to this type of light. In this paper, we show how attackers can use surveillance cameras and infrared light to establish bi-directional covert communication…

Cryptography and Security · Computer Science 2017-09-19 Mordechai Guri , Dima Bykhovsky , Yuval Elovici

Air-gapped computers are systems that are kept isolated from the Internet since they store or process sensitive information. In this paper, we introduce an optical covert channel in which an attacker can leak (or, exfiltlrate) sensitive…

Cryptography and Security · Computer Science 2020-02-05 Mordechai Guri , Dima Bykhovsky , Yuval Elovici

It is possible to attack a computer remotely through the front panel LEDs. Following on previous results that showed information leakage at optical wavelengths, now it seems practicable to inject information into a system as well. It is…

Cryptography and Security · Computer Science 2019-07-02 Joe Loughry

In this paper, we show that attackers can leak data from isolated, air-gapped computers to nearby smartphones via covert magnetic signals. The proposed covert channel works even if a smartphone is kept inside a Faraday shielding case, which…

Cryptography and Security · Computer Science 2018-02-08 Mordechai Guri , Andrey Daidakulov , Yuval Elovici

Cybersecurity continues to be a difficult issue for society especially as the number of networked systems grows. Techniques to protect these systems range from rules-based to artificial intelligence-based intrusion detection systems and…

Cryptography and Security · Computer Science 2022-05-10 Paul Maxwell , David Niblick , Daniel C. Ruiz

In this paper we show how attackers can covertly leak data (e.g., encryption keys, passwords and files) from highly secure or air-gapped networks via the row of status LEDs that exists in networking equipment such as LAN switches and…

Cryptography and Security · Computer Science 2017-06-06 Mordechai Guri , Boris Zadov , Andrey Daidakulov , Yuval Elovici

Any secure network is only as secure as its weakest component. With overt channels tightly secured and attackers have started focusing on optical, audible, magnetic, and thermal covert channels to access sensitive systems. In this paper, we…

Cryptography and Security · Computer Science 2019-11-05 Weeam Alshangiti , Rafid Saad

Machine learning has become a key tool in cybersecurity, improving both attack strategies and defense mechanisms. Deep learning models, particularly Convolutional Neural Networks (CNNs), have demonstrated high accuracy in detecting malware…

Cryptography and Security · Computer Science 2025-03-04 Matteo Brosolo , Vinod Puthuvath , Mauro Conti

In the era of the internet and smart devices, the detection of malware has become crucial for system security. Malware authors increasingly employ obfuscation techniques to evade advanced security solutions, making it challenging to detect…

Cryptography and Security · Computer Science 2024-04-04 S M Rakib Hasan , Aakar Dhakal

It is known that malware can leak data from isolated, air-gapped computers to nearby smartphones using ultrasonic waves. However, this covert channel requires access to the smartphone's microphone, which is highly protected in Android OS…

Cryptography and Security · Computer Science 2022-08-23 Mordechai Guri

In this paper we present a method which allows attackers to covertly leak data from isolated, air-gapped computers. Our method utilizes the hard disk drive (HDD) activity LED which exists in most of today's desktop PCs, laptops and servers.…

Cryptography and Security · Computer Science 2017-02-23 Mordechai Guri , Boris Zadov , Eran Atias , Yuval Elovici

Delivering malware covertly and evasively is critical to advanced malware campaigns. In this paper, we present a new method to covertly and evasively deliver malware through a neural network model. Neural network models are poorly…

Cryptography and Security · Computer Science 2022-02-15 Zhi Wang , Chaoge Liu , Xiang Cui

Every attack begins with gathering information about the target. The entry point for network breaches are often vulnerabilities in internet facing websites, which often rely on an off-the-shelf Content Management System (CMS). Bot networks…

Cryptography and Security · Computer Science 2023-01-26 Daniel Reti , Karina Elzer , Hans Dieter Schotten

In this article, we explored orthogonal methods to analyze malware motivated by signal and image processing. Malware samples are represented as images or signals. Image and signal-based features are extracted to characterize malware. Our…

Cryptography and Security · Computer Science 2016-05-18 Lakshmanan Nataraj , B. S. Manjunath

The proliferation of Internet of Things (IoT) devices has raised significant concerns regarding their security vulnerabilities. This paper explores the security risks associated with smart light systems, focusing on covert communication…

Cryptography and Security · Computer Science 2024-08-28 Ravisha Rohilla , Janvi Panwar

Computing is still under a significant threat from ransomware, which necessitates prompt action to prevent it. Ransomware attacks can have a negative impact on how smart grids, particularly digital substations. In addition to examining a…

Cryptography and Security · Computer Science 2024-05-02 Hong-Nhung Nguyen , Ha-Thanh Nguyen , Damien Lescos

Malware writers frequently try to hide the activities of their agents within tunnelled traffic. Within the Kill Chain model the infection time is often measured in seconds, and if the infection is not detected and blocked, the malware…

Cryptography and Security · Computer Science 2019-07-30 Peter McLaren , William J Buchanan , Gordon Russell , Zhiyuan Tan

We note that constituent fields (notably the fraction-of-seconds timestamp field) in the data payload structure of the synchrophasor communication protocol (IEEE C37.118 standard) are overprovisioned relative to real-world usage and needs,…

Cryptography and Security · Computer Science 2025-08-28 Prashanth Krishnamurthy , Ramesh Karri , Farshad Khorrami

Highly secure devices are often isolated from the Internet or other public networks due to the confidential information they process. This level of isolation is referred to as an 'air-gap .' In this paper, we present a new technique named…

Cryptography and Security · Computer Science 2022-08-23 Mordechai Guri

In recent years, there has been a noticeable increase in cyberattacks using ransomware. Attackers use this malicious software to break into networks and harm computer systems. This has caused significant and lasting damage to various…

Cryptography and Security · Computer Science 2024-02-06 Ali Mehrban , Shirin Karimi Geransayeh
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