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Clear Channel Assessment Attack
A clear channel assessment attack or Queensland attack is a physical layer DoS attack against Wi-Fi networks. The attack focuses the need of a wireless network to receive the "clear channel assessment"; which is a function within CSMA/CA to determine whether the wireless medium is ready and able to receive data, so that the transmitter may start sending it. The attack makes it appear that the airwaves are busy, which basically puts the entire system on hold. The attack works only on 802.11b, and is not effective on the OFDM-based protocols 802.11g and 802.11a. However, some hybrid 802.11b/g access points will hinder the 802.11g network when the 802.11b network is attacked. Discovery The attack was originally discovered by researchers at Queensland University of Technology's Information Security Research Center, thus it is where the name ''Queensland attack'' comes from. In practice The signal telling the system the airwaves are busy is of course sent through the attacker's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Physical Layer
In the seven-layer OSI model of computer networking, the physical layer or layer 1 is the first and lowest layer: the layer most closely associated with the physical connection between devices. The physical layer provides an electrical, mechanical, and procedural interface to the transmission medium. The shapes and properties of the electrical connectors, the frequencies to transmit on, the line code to use and similar low-level parameters, are specified by the physical layer. At the electrical layer, the physical layer is commonly implemented in a dedicated PHY chip or, in electronic design automation (EDA), by a design block. In mobile computing, the MIPI Alliance *-PHY family of interconnect protocols are widely used. Role The physical layer defines the means of transmitting a stream of raw bits over a physical data link connecting network nodes. The bitstream may be grouped into code words or symbols and converted to a physical signal that is transmitted over ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DoS Attack
In computing, a denial-of-service attack (DoS attack) is a cyberattack in which the perpetrator seeks to make a machine or network resource unavailable to its intended users by temporarily or indefinitely disrupting services of a host connected to a network. Denial of service is typically accomplished by flooding the targeted machine or resource with superfluous requests in an attempt to overload systems and prevent some or all legitimate requests from being fulfilled. The range of attacks varies widely, spanning from inundating a server with millions of requests to slow its performance, overwhelming a server with a substantial amount of invalid data, to submitting requests with an illegitimate IP address. In a distributed denial-of-service attack (DDoS attack), the incoming traffic flooding the victim originates from many different sources. More sophisticated strategies are required to mitigate this type of attack; simply attempting to block a single source is insufficient ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wi-Fi
Wi-Fi () is a family of wireless network protocols based on the IEEE 802.11 family of standards, which are commonly used for Wireless LAN, local area networking of devices and Internet access, allowing nearby digital devices to exchange data by radio waves. These are the most widely used computer networks, used globally in small office/home office, home and small office networks to link devices and to provide Internet access with wireless routers and wireless access points in public places such as coffee shops, restaurants, hotels, libraries, and airports. ''Wi-Fi'' is a trademark of the Wi-Fi Alliance, which restricts the use of the term "''Wi-Fi Certified''" to products that successfully complete Interoperability Solutions for European Public Administrations, interoperability certification testing. Non-compliant hardware is simply referred to as WLAN, and it may or may not work with "''Wi-Fi Certified''" devices. the Wi-Fi Alliance consisted of more than 800 companies from ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CSMA/CA
Carrier-sense multiple access with collision avoidance (CSMA/CA) in computer networking, is a link layer multiple access method in which carrier sensing is used. Under CSMA/CA, nodes attempt to avoid collisions by beginning transmission only after the channel is sensed to have no traffic. When they do transmit, nodes transmit frames in their entirety. This technique is primarily used in wireless networks, where the alternative with collision detection CSMA/CD is not possible due to wireless transmitters de-sensing (turning off) their receivers during packet transmission. CSMA/CA is unreliable due to the hidden node problem. Details Collision avoidance is used to improve the performance of the CSMA method by attempting to divide the channel somewhat equally among all transmitting nodes within the collision domain. # Carrier Sense: prior to transmitting, a node first listens to the shared medium (such as listening for wireless signals in a wireless network) to determine whe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Griffith University
Griffith University is a public university, public research university in South East Queensland on the Eastern states of Australia, east coast of Australia. The university was founded in 1971, but was not officially opened until 1975. Griffith University is credited with introducing Australia's first degrees in environmental science and Asian studies. The university has five campuses, at Gold Coast, Queensland, Gold Coast, Nathan, Queensland, Nathan, Logan City, Logan, South Bank, Queensland, South Bank, and Mount Gravatt, Queensland, Mount Gravatt. A sixth campus, to be located at the Treasury Building, Brisbane, Treasury Building in the Brisbane central business district, Brisbane CBD, will open in 2027. The university was named after Samuel Griffith, Sir Samuel Walker Griffith, who was twice Premier of Queensland and the first Chief Justice of the High Court of Australia. Sir Samuel Griffith played a major role in the Federation of Australia and was the principal author of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Queensland University Of Technology
The Queensland University of Technology (QUT) is a public university, public research university located in the city of Brisbane in Queensland, Australia. It has two major campuses, a modern city campus in Gardens Point, Brisbane, Gardens Point and a historical campus in Kelvin Grove, Queensland, Kelvin Grove. The university offers courses in fields including architecture, engineering, information technology, healthcare, teaching, law, arts and design, science and mathematics. QUT operated as the Queensland Institute of Technology (QIT'')'' established in 1965 receiving university status by act of Parliament of Queensland in 1988. Queensland University of Technology commenced operations the following year in January 1989. The Brisbane College of Advanced Education, an amalgamation of tertiary colleges dating back to 1849, merged with QUT expanding to its Kelvin Grove site in 1990. In 2022, QUT enrolled 50,216 students, including 37,860 undergraduate and 11,760 postgraduate stud ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Information Security Research Center
Information is an abstract concept that refers to something which has the power to inform. At the most fundamental level, it pertains to the interpretation (perhaps formally) of that which may be sensed, or their abstractions. Any natural process that is not completely random and any observable pattern in any medium can be said to convey some amount of information. Whereas digital signals and other data use discrete signs to convey information, other phenomena and artifacts such as analogue signals, poems, pictures, music or other sounds, and currents convey information in a more continuous form. Information is not knowledge itself, but the meaning that may be derived from a representation through interpretation. The concept of ''information'' is relevant or connected to various concepts, including constraint, communication, control, data, form, education, knowledge, meaning, understanding, mental stimuli, pattern, perception, proposition, representation, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AusCERT
AusCERT is a non-profit organisation founded in 1993 that provides advice, education and solutions to cybersecurity threats and vulnerabilities. Their office is located on the University of Queensland campus. History In the early 1990s, Australian university student Nahshon Even-Chai hacked into the NASA computer system in his spare time. In response to this incident, three Australian universities (Queensland University of Technology, Griffith University, and the University of Queensland) formed AusCERT, which aimed to create a central source for information security and protection. Services AusCERT services include phishing take-downs, security bulletins, incident notifications, sensitive information alerts, early warning SMS, and malicious URL feeds. AusCERT is one of many computer emergency response teams (CERTs) and a member of FIRST, a worldwide network of computer security incident response and security teams. They are also a charter member oAPCERT AusCERT Annu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Network Interface Controller
A network interface controller (NIC, also known as a network interface card, network adapter, LAN adapter and physical network interface) is a computer hardware component that connects a computer to a computer network. Early network interface controllers were commonly implemented on expansion cards that plugged into a computer bus. The low cost and ubiquity of the Ethernet standard means that most newer computers have a network interface built into the motherboard, or is contained into a USB-connected dongle, although network cards remain available. Modern network interface controllers offer advanced features such as interrupt and Direct memory access, DMA interfaces to the host processors, support for multiple receive and transmit queues, partitioning into multiple logical interfaces, and on-controller network traffic processing such as the TCP offload engine. Purpose The network controller implements the electronic circuitry required to communicate using a specific physica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prism Test Utility
PRISM is a code name for a program under which the United States National Security Agency (NSA) collects internet communications from various U.S. internet companies. The program is also known by the SIGAD . PRISM collects stored internet communications based on demands made to internet companies such as Google LLC and Apple under Section 702 of the FISA Amendments Act of 2008 to turn over any data that match court-approved search terms. Among other things, the NSA can use these PRISM requests to target communications that were encrypted when they traveled across the internet backbone, to focus on stored data that telecommunication filtering systems discarded earlier, and to get data that is easier to handle. PRISM began in 2007 in the wake of the passage of the Protect America Act under the Bush Administration. The program is operated under the supervision of the U.S. Foreign Intelligence Surveillance Court (FISA Court, or FISC) pursuant to the Foreign Intelligence Surv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
