We propose a new method of differential fault attack, which is based on the nibble-group differential diffusion property of the lightweight block cipher MIBS. On the basis of the statistical regularity of differential distribution of the S-box, we establish a statistical model and then analyze the relationship between the number of faults injections, the probability of attack success, and key recovering bits. Theoretically, time complexity of recovering the main key reduces to 22 when injecting 3 groups of faults (12 nibbles in total) in 30,31 and 32 rounds, which is the optimal condition. Furthermore, we calculate the expectation of the number of fault injection groups needed to recover 62 bits in main key, which is 3.87. Finally, experimental data verifies the correctness of the theoretical model.

The main contribution of this paper is to characterize the hyperbentness of two infinite classes of Boolean functions via Dillon-like exponents, and give new classes of semibent functions with Dillon-like exponents and Niho exponents. In this paper, the approaches of Mesnager and Wang et al. are generalized to Charpin-Gong like functions with two additional trace terms. By using the partial exponential sums and Dickson polynomials, it also gives the necessary and sufficient conditions of the hyperbent properties for their subclasses of Boolean functions, and gives two corresponding examples on F230. Thanks to the result of Carlet et al., new classes of semibent functions are obtained by using new hyperbent functions and the known Niho bent functions. Finally, this paper extends the Works of Lisonek and Flori and Mesnager, and gives different characterizations of new hyperbent functions and new semibent functions with some restrictions in terms of the number of points on hyperelliptic curves. These results provide more nonlinear functions for designing the filter generators of stream ciphers.

In this letter, we propose a new State Model for IPv6 Interfaces, which can help the administrator in determining the status of the IPv6 Interface at any instant. This State Model is superior to the current model as it provides additional information as to why an IPv6 Interface is unavailable for performing the provisioned service and, it is also flexible to define new Secondary State and Secondary State Qualifiers in the future. This State Model helps the administrator to decide what actions he may need to take to bring the Interface UP. Ths State Model is based on the Control State Machine implemented in the Samsung's IPv6 Protocol Stack.

A new optical access system based on the synchronous transfer mode - passive double star system has been developed to provide high-speed LAN-like access. It uses a shared-band method that enables multiple users to efficiently share a single bandwidth of up to 10 Mb/s and a grouping function that divides the access network into several logical networks, each of which can provide a virtual LAN to users. This paper describes an information model and a framework for configuration management and fault management and discusses the requirements for element management, which involves data-link establishment, logical group management, and testing. Element management mainly requires appropriate remote handling on data cards installed in each optical network unit on user premises. A method is proposed that satisfies these requirements. With this method, the element operations system can provide the required operational functionality.

Measuring traffic dynamics during intervals of a few seconds is important in the management of network performance. If the distribution of average traffic volume during a few seconds is measured, an administrator can manage the quality of the networks using the α percentile of the distribution. We propose a method of estimating the distribution of traffic volume during short intervals, such as a few seconds, by using only traffic information from the management information base (MIB) of routers or switches. This estimation method is based on traffic characteristics that are observed in traffic measurements in actual networks. It imposes little additional load on routers or switches and the computation time required to estimate the distribution is also short. Numerical examples using actual traffic data are also given.

This paper discusses a design and an implementation of a MIB tester, a conformance test tool of Management Information Base (MIB) for TMN. A remote test method is used as a practical test configuration. We classify test purposes into three; basic interconnection test, capability test and behaviour test. Test items for the capability test are defined according to Managed Object Conformance Statement (MOCS) and Managed Relationship Conformance Statement (MRCS). Test items for the behaviour test is defined according to GDMO BEHAVIOUR clause. The MIB tester automatically generates test scenarios for capability tests, which are also used as those for the basic interconnection test, and supports the scenario creation of the behaviour test in an user-friendly manner. We evaluate the implemented MIB tester through its application to the actual TMN agents.

The up and coming multimedia services are based on real-time high-speed networks. For efficient operation of such services, real-time and precise network management is essential. In this paper, we show that presently available MIB designs are severely inadequate to support real-time network management. We point out and analyze the management constraints and bottlenecks. The concept of quality of management of management information is introduced and its importance in practical network management is discussed. We have proposed a new MIB architecture that will raise the quality of management information to meet the requirements of managing high-speed networks and multimedia services. Experimental results from a prototype implementation of the new MIB architecture are presented.