23 research outputs found
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BVPSMS: A Batch Verification Protocol for End-to-End Secure SMS for Mobile Users
Short Message Service (SMS) is a widely used communication medium for mobile applications, such as banking, social networking, and e-commerce. Applications of SMS services also include real-time broadcasting messages, such as notification of natural disasters and terrorist attacks, and sharing the current whereabouts to other users, such as notifying urgent business meeting information, transmitting quick information in the battlefield to multiple users, notifying current location to our friends, and sharing market information. However, traditional SMS is not designed with security in mind (e.g. messages are not securely sent). In this paper, we introduce a batch verification Authentication and Key Agreement (AKA) protocol, BVPSMS, which provides end-to-end message security over an insecure communication channel between different Mobile Subscribers (MSs). Specifically, the proposed protocol securely transmits SMS from one MS to multiple MS simultaneously. We then evaluate the performance of the BVPSMS protocol in terms of communication and computation overheads, protocol execution time, and batch and re-batch verification times. The impacts of the user mobility, and the time, space, and cost complexity analysis are also discussed. We present a formal proof of the proposed protocol. To the best of our knowledge, this is the first provably-secure batch verification AKA protocol, which provides end-to-end security to the SMS using symmetric keys
BAS-VAS: A novel secure protocol for value added service delivery to mobile devices
Mobile operators offer a wide range of valueadded services (VAS) to their subscribers (i.e., mobile users), which in turn generates around 15% of the telecommunication industry revenue. However, simultaneous VAS requests from a large number of mobile devices to a single server or a cluster in an internet-of-things (IoT) environment could result in an inefficient system, if these requests are handled one at a time as the present traditional cellular network scenario is. This will not only slow down the server’s efficiency but also adversely impacts the performance of the network. The current (insecure) practice of transmitting user identity in plaintext also results in traceability. In this paper, we introduce the first known protocol designed to efficiently handle multiple VAS requests at one time, as well as ensuring the secure delivery of the services to a large number of requesting mobile users. The proposed batch verification protocol (BAS-VAS) is capable of authenticating multiple simultaneous requests received by a large number of mobile users. We demonstrate that the protocol preserves user privacy over the network. The provider’s servers ensure the privacy of the requested service’s priority by performing sorting over encrypted integer data. The simulation results also demonstrate that the proposed protocol is lightweight and efficient in terms of communication and computation overheads, protocol execution time, and batch and re-batch verification delay. Specifically, we perform batch and re-batch verification (after detecting and removing malicious requests from the batch) for multiple requests in order to improve the overall efficiency of the system, as well as discussing time, space and cost complexity analysis, along with the security proof of our protocol using Proverif
Development of an Adaptive Environmental Management System for Lejweleputswa District: A Participatory Approach through Fuzzy Cognitive Maps
Published ThesisEnvironmental pollution caused by mines within the district of Lejweleputswa in Free
State is a major contributor to health issues and the inability to grow crops within the
mining communities. Mining industries continue to develop environmental
management systems/plans to mitigate the impact their operations has on the society.
Even with these plans, there are still issues of environmental pollution affecting the
society. Though there are Information Communication and Technology (ICT) based
pollution monitoring solutions, their use is dismal due to lack of appreciation or
understanding of how they disseminate information. Furthermore, non-adopting
community members are being regarded as inherently conservative or irrational, but
these community members argue that the recommendations and technologies brought
to them are not always appropriate to their circumstances. There was concern that
local people’s knowledge of their environment, farming systems, and their social as
well as economic situation had been ignored and underestimated when ICTs solutions
are being implemented (Warburton & Martin, 1999). Another challenge is that there is
no station to monitor pollution for small communities such as Nyakallong in the district.
This result in mining communities depending on their own local knowledge to observe and monitor mining related environmental pollution. However, this local knowledge
has never been tested scientifically or analysed to recognize its usability or
effectiveness. Mining companies tend to ignore this knowledge from the communities
as it is treated like common information with no much scientific value. As a step
towards verifying or validating this local knowledge, fuzzy cognitive maps were used
to model, analyse and represent this linguistic local knowledge.
Although this local knowledge assists in mitigating environmental pollution,
incorporating it with scientific knowledge will improve its relevance, trustworthiness
and acceptability by majority of community members and policy-makers. Information
and Communication Technologies (ICTs) can accelerate this integration; this is the
focus of this research. The increased usages of Information Technology being witnessed today makes it the
most important factor for the world to depend on for solutions to many of today’s and
tomorrow’s problems. These solutions make use of various forms for dissemination
purposes, one of the most versatile dissemination device is a mobile phone since majority of the world’s population do own a mobile phone. In this way information is
easily accessible by almost everyone that needs it.
A novel environmental management solution was designed to work within the mining
communities of Lejweleputswa. The research started off by designing a unique
integration framework that creates the much-needed link between local knowledge
and scientific knowledge. The framework was then converted into an adaptable
environmental pollution management system prototype made up of three components;
(1) gathering environmental pollution knowledge; (2) environmental monitoring and;
(3) environmental dissemination and communication. To achieve sustainability,
relevance and acceptability, local knowledge was integrated in each of the three
components while mobile phones were used as both input and output devices for the
system. In order to facilitate collection and conservation of local knowledge on
environmental monitoring, an elaborate android-based mobile application was
developed. Wireless sensor-based gas sensor boards were acquired, and deployed
as a compliment to conventional monitoring stations, they were used to gather
scientific knowledge. To allow for public access to the system’s data, a web portal and an SMS-based component were also implemented. In order to collect local knowledge
from community, a case study of Nyakallong community in Lejweleputswa was carried
out. On completion of the system prototype, it was evaluated by participants from the
community; 90% of respondents gave a score of ‘excellent ‘
A Review of Resonant Converter Control Techniques and The Performances
paper first discusses each control technique and then gives experimental results and/or performance to highlights their merits. The resonant converter used as a case study is not specified to just single topology instead it used few topologies such as series-parallel resonant converter (SPRC), LCC resonant converter and parallel resonant converter (PRC). On the other hand, the control techniques presented in this paper are self-sustained phase shift modulation (SSPSM) control, self-oscillating power factor
control, magnetic control and the H-∞ robust control technique
State-Feedback Controller Based on Pole Placement Technique for Inverted Pendulum System
This paper presents a state space control technique for inverted pendulum system using simulation and real experiment via MATLAB/SIMULINK software. The inverted pendulum is difficult system to control in the field of control engineering. It is also one of the most important classical control system problems because of its nonlinear characteristics and unstable system. It has three main problems that always appear in control application which are nonlinear system, unstable and non-minimumbehavior
phase system. This project will apply state feedback controller based on pole placement technique which is capable in stabilizing the practical based inverted pendulum at vertical position. Desired design specifications which are 4 seconds settling time and 5 % overshoot is needed to apply in full state feedback controller based on pole placement technique. First of all, the mathematical model of an inverted pendulum system is derived to obtain the state space representation of the system. Then, the design phase of the State-Feedback Controller can be conducted after linearization technique is
performed to the nonlinear equation with the aid of mathematical aided software such as Mathcad. After that, the design is simulated using MATLAB/Simulink software. The controller design of the inverted pendulum system is verified using simulation and experiment test. Finally the controller design is compared with PID controller for benchmarking purpose
A SIMULATION STUDY OF STATE-FEEDBACK CONTROL METHOD FOR ELECTRO HYDRAULIC SERVO MODEL
Electro hydraulic servo system is used by many industries due to its ability to impart large forces.
It also has advantage in term of fast response and robustness. The electro hydraulic system suffered
from errors of the transient response which are steady state error, settling time and the ripples. It
is crucial to design a controller for the system to ensure the reliability of the system. Aiming at the
characteristic of the system, steady state feedback control method is designed to compensate the
error. The analysis of the system is done based on the transient response specifically on the actuator
part. MATLAB Simulink is used as the simulation software to evaluate the force performance of
state feedback controller method. The steady state error, settling time and ripple are observed and
recorded for each controller. Three methods is applied, which are full feedback, state feedback with
feed forward and integral control are compared with proportional, integral and derivatives (PID)
controller. The result of each controller shows the differences performance. Based on the simulation
results, the feedforward technique is found to be the best control technique for the electro hydraulic
servo system due to the requirement performance such as percent overshoot, settling time, rise time
and zero steady state error. This good result will directly benefit industries that use electro hydraulic
system as their actuator for production machines