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About 10,000 papers for “Computer access control”

Computer-supported access control

Gunnar Stevens, Volker Wulf · ACM Transactions on Computer-Human Interaction · 2009

Traditionally, access control is understood as a purely technical mechanism which rejects or accepts access attempts automatically according to a specific preconfiguration. However, such a perspective neglects the practices of access control and the embeddedness of technical mechanisms within situated action. In this article, we reconceptualize the issue of access control on a theoretical, methodological, and practical level. On a theoretical level, we develop a terminology to distinguish between access control practices and the technical support mechanisms. We coin the term Computer Supported Access Control (CSAC) to emphasize this perspective. On a methodological level, we discuss empirical investigations of access control behavior from a situated action perspective. We discovered a differentiated set of social practices around traditional access control systems. By applying these findings to a practical level, we enhance the design space of computer supported access control mechanisms by suggesting a matrix of technical mechanisms which go beyond an ex-ante configuration.

Cited by 21

Smart Card for Computer Access Control

National Institute of Standards and Technology and Technology · National Institute of Standards and Technology (NIST)

“Since the early 1970's, NIST has been developing cost-effective ways to help protect computerized data. These methods include sound management practices as well as technical solutions. NIST has devised a prototype system for controlling access to a computer system that uses a password, a smart card, a fingerprint reader, and cryptography.”\n\nReferences:\n\nNIST at a Glance. NIST Special Publication 764, (June 1990.) p. 6. \n\nSmart-Card Technology: New Methods for Computer Access Control. Martha E. Haykin and Robert B. J. Warnar, NIST Special Publication 500-157, (September 1988.) \n

Cited by 0Open access

Smart card, computer security, access control, cryptology

Spesivtsev, Wegner, Krytjakov et al. · 1993

An alternative approach to applications which need expensive smart cards with cryptoprocessors is suggested. The idea is to perform cryptographic features in special smart card reading devices. Thus, the price of data protection and access control in computing systems and networks may be substantially reduced. In most applications cheap EEPROM smart cards can be used instead of microprocessor cards.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Cited by 0

Unauthorized access control in water utility computer networks

Ioan Florin VOICU, Dragos Cristian DIACONU, Daniel Constantin DIACONU · RePEc: Research Papers in Economics

Virtual tampering in water utility systems can lead to highly dangerous real-world situations such as shortages and permanent damage to infrastructure. While cybersecurity guidelines do exist for Romanian companies like ApaNova, they are inadequate for protecting the water supply chain. Evaluating the potential vulnerabilities such systems have and presenting open-source methods to improve them is critical for the cybersecurity sustainability of utility services. Building on previous research regarding network cybersecurity, Kali Linux was used as a penetration testing platform in conjunction with an OPNSense-based network configuration. Initially the test included just the Apa Nova-mandated security settings (focusing on ransomware & database access protection), after which additional protective layers were added. The first extra layer was VLAN network segmentation, in compliance with Environmental Protection Agency (EPA)’s America's Water Infrastructure Act (AWIA) guidelines. Afterwards, additional settings were added, such as: Intrusion Detection Systems (IDS) & Intrusion Prevention Systems (IPS); Employee access only via Virtual Private Network (VPN) and Medium Access Control (MAC) address filtering for all employee Wi-Fi devices. A monitoring solution inOPNSense was also implemented, in order to be informed of any suspicious activity on the network. In conjunction with this, a patching strategy was created, which would minimize downtime, while ensuring the system is kept up to date. This is facilitated by the open-source nature of OPNSense, which does not need costly license upgrades to remain secure. The results showed that while protection against ransomware/viruses is important and relatively easy to implement, testing confirmed the findings of previous articles that malicious internal actors are an even greater threat than viruses. This requires constant protection and monitoring against privilege misuse by even authorized personnel. A wider view is offered on how easy it is to gain access to current systems and several off-the-shelf open-source software solutions are highlighted that can prevent water utility shutdown or misuse by malicious actors.

Cited by 0

A universal frame of access control in computer networks

Burda, Karel · Brno University of Technology Digital Library (Brno University of Technology) · 2011

In the paper, a universal frame of access control in computer networks is described. The proposed frame enables the modular construction of arbitrary complex access control system with arbitrary topology. The proposed frame has an open character, which enables its extension in the future.

Cited by 0

Collision-Free Access Control for Computer Communication Bus Networks

Kapali P. Eswaran, Volkmar Hamacher, Gerald S. Shedler · IEEE Transactions on Software Engineering · 1981

This paper considers access control for local area computer communication networks. We propose two distributed access control schemes for a bus network. The schemes are simple and asynchronous, and provide for collision-free communication among ports. In addition, one of the schemes provides a bounded, guaranteed time to transmisidon for each port. We also show that this scheme is efficient in the use of the bus bandwidth, in the sense that there is only a small fraction of time during which the bus is idle when there is at least one packet available for transmission.

Cited by 25

Model of control access process in wireless computer network

Mykhailo O. Slabyshev, Anatolij G. Berdnikov · Bulletin of V N Karazin Kharkiv National University series «Mathematical modeling Information technology Automated control systems» · 2020

The problem of ensuring the minimum delivery time of information with prevention of collisions is a pressing problem in ACS TP, since collisions often occur during transmission or the delay time of information is not optimal. This problem is solved by the use of wireless computer networks and methods of information transmission with collision prevention, which affect the delay time of information transmission. The developed model of the access control process in wireless computer networks solves the problem of effective information transfer with collision prevention. The purpose of using this model is to reduce the delay in information transmission. ACS TP often needs modernization as technical innovations are becoming available. At the same time, the quality of production should not fluctuate. The most important element of modernization is the use of wireless technologies that save money and time, compared to the deployment of wired networks. The aim of the work is to develop the model of control access process in a wireless computer network with collision prevention. The process of forming delay slots for information transfer has been researched. The object of the study is a wireless computer network in the ACS TP. The subject of the study is a model of control access process in a wireless computer network with collision prevention. The research objectives are to create requirements for the model, to propose a structure, to create a model, to conduct tests and evaluate the obtained results. The model of access control process in a wireless computer network designed to transmit information with prevention of collisions in a wireless computer network has been developed.

Cited by 0Open access

An Adaptive Medium Access Control Protocol for Computer Network

Piyush Kumar Shukla, Sanjay Silakari, Sujeet Singh Bhadouria et al. · 2009

We applied a dynamic channel allocation scheme to get better utilization when the traffic is unpredictable or fluctuating. In contention resolution approaches if multiple users transmit at the same time a collision occurs and the packets must be retransmitted according to some predefined rule. In random access protocols a transmission is not guaranteed to be a successful one. The challenge of designing an efficient Medium Access Control (MAC) protocol is a big issue. This paper focuses on the performance analysis (through simulation) and modification of a well known MAC protocol .The purpose of this work is to modify the existing protocol by enabling it to adapt according to state of the network and understanding the effect of unpredicted load fluctuations The modified protocol takes appropriate action whenever unutilized periods detected and it should also be In this way, to increase the effective bandwidth utilization and determine how it behaves under increasing load, and varying packet sizes.

Cited by 0

Access Control System for Radioisotope Facility with Personal Computer.

Shogo Suzuki · RADIOISOTOPES · 1994

An access control system with a personal computer has been developed for radioisotope facility. The developed system is composed of a NEC PC-9801 UX2 personal computer having two of 1 Mbyte floppy-disk drivers and extended random access memory (2 Mbyte), automatic door and two of non-contact identification card scanners (Nippon ID System Inc. ) . The identification card scan-ners are controlled by the personal computer via RS-232C. By the use of the non-contact identification card, user's name and entrance and leaving times are recorded automatically in a file.

Cited by 1Open access

The access control mechanism of a database computer (DBC)

M. Jaishankar Menon, David K. Hsiao · ACM SIGIR Forum · 1980

The database computer (DBC) is a specialized back-end computer which is capable of managing data 10 10 bytes in size and supporting known data models such as relational, network, hierarchical and attribute-based models. It is also perhaps the first database machine to have a built-in security mechanism for access control. At the outset, the security mechanism was made an integral part of the DBC design. This design philosophy not only allowed us to construct a system that has no “backdoors”, but also ensured that all access requests are, in fact, controlled by DBC's security mechanism. The DBC security mechanism is based on the concept of security atoms, aggregates of data units being definable by the user in terms of conjunctions of query predicates. The fundamental gain in utilizing query conjunctions for the purpose of access control is that any data that is accessible or updateable is also protectable. It is believed that the DBC security mechanism is less cumbersome than the view mechanism of some database systems and more efficient than the query modification mechanism used by some other systems. This is demonstrated at three levels of access control, namely the subfile, record and field (attribute) levels.

Cited by 3