Earticle

The rapid development of network brings new opportunities for online education, the network language gradually become a new hot spot. Modern information technology provides infinite possibility for the classroom teaching, in this paper, we focus on the motivation of college students to use the network language, and hope to provide scientific and effective measuring tool for the related research of network language. The results showed that under the significance level of 0.05, grade and the often use network language has significant influence to expressing strategy, junior student are more inclined to use the internet language. At the same time, there is no difference in gender and specialty of College Students' network language; this shows that gender differences are gradually weakened in the using of network language. On this basis, we put forward relevant suggestions.

Side-channel Analysis (SCA) has become a reliable method for cryptanalysts to break cryptographic algorithms. Recently, SCA is used to reverse engineer the applet bytecodes on Java based smart cards. In addition of Power Analysis, other techniques of SCA exist, such as Electromagnetic Analysis (EMA). EMA of smart cards is a powerful technique that allows extracting information about the executed bytecode as well as about the processed data. In our work, we study the possibility to apply reverse engineering upon a Java Card applet in which the virtual machine is obfuscated by using SCA techniques. Even if this process of bytecode obfuscation is an effective way to prevent execution of an arbitrary and malicious bytecode, we believe that it can be systematically bypassed regardless the level of the platform encryption under the reverse engineering trails. In this paper, we present a methodology that could be used to find out the encryption key of the obfuscation process using the reverse engineering process through SCA. To perform reverse engineering, a white box approach providing access to the Java Card is needed in a learning stage, and then the technique used can be used on a black box approach where the code of applications is not accessible at the matching stage.

With the development of the network organization, the psychological contract theory has become an important tool to promote the efficiency of the network organization. In this paper, we test the psychological contract problems from college physical education teachers, and try to improve their mental health. By using empirical analysis, the result shows that in four-dimensional degree of PE Teachers' psychological contract: RMSEA=0.06, GFI=0.95, CFI=0.94, IFI=0.94, NNFI=0.9. And in three-dimensional degree of colleges responsibility: RMSEA = 0.066, GFI = 0.92, CFI = 0.93, IFI = 0.93, NFI = 0.92. So that ,the dimensional structure is a reasonable assumption, at the same time, the overall situation of university teachers' psychological contract is good, the degree of importance as follows: development contract, the basic guarantee contracts, contract trading norms, interpersonal contract, balancing contracts, management contracts and innovation contract.

Multimedia teaching is a new kind of teaching mode, it makes multimedia computer as the core, and includes sound, images, text and animation. In multimedia teaching, teaching is always the main body, and multimedia is to cooperate with the teaching. In this paper, we make empirical analysis of performance evaluation of the multimedia teaching, the study subjects is martial arts courses in colleges. The result shows that after experiment, the students’ psychological quality and body movement quality have very significant increase, Body function and body form has improved. At the same time, college students give a better evaluation of the multimedia class, so multimedia teaching is worth promoting.

When Global Positioning Systems are obstructed, standalone pedestrian tracking can be very daunting. Users in such obstructed environments (especially in home environments) will find it difficult to perform on-site navigation. It is important to create a standalone pedestrian tracking system that provides better location determination services with less computational complexity and deployment cost. One promising way to implement this service is through the use of Inertial Measurement Unit (IMU) sensors. This tracking method provides the pinpointing of standalone tracking information but is handicapped by missing stance phase during pedestrian walking activities. A new pedestrian stance detection using simultaneously localization and mapping (SLAM) will be designed in this paper with a focus on robust indoor positioning systems. We will present our preliminary results to illustrate the performance of the system for an indoor environment set-up at the end of this paper.

Tor is a popular low-latency anonymous communication system which could provide anonymity and anti-censorship. Based on previous researches on de- anonymization of Tor, this paper proposes a novel approach to attack users’ guard selection which can pose great threat against Tor users' anonymity. Under the current design of Tor, once entry guards are compromised, the probability that an attacker observes both ends of a Tor circuit will be highly improved. Actual and simulated experiments both show that an attacker (e.g., a local or national government which have the power to monitor a Tor user’s internet connection) can successfully compromise a specific Tor user’s entry guard in about 30 minutes, and this can further help de-anonymize the user’s anonymous communication.

With the rapid development of information technology, personal computer privacy and permission management are becoming more and more important. Based on RSA encryption algorithm, we design a dynamic password encryption and codec algorithm, and propose a mechanism on computer access permission management which is capable of dealing with situations both online and offline. In the offline mode, administrators can authenticate users by matching their contact information to that registered in administrators’ mobile terminal. Generated by the co-work of a personal computer and a mobile terminal, the dynamic password makes cracking the password a trickier task. Permission control information is also added into the dynamic password, and file filter system will be loaded once the screen is successfully unlocked, so as to protect private directories or files from being accessed without authorization. In online mode, the system provides real-time video for identity verification, which makes the system more secure and convenient. Experiment results show that this dynamic password based mechanism on computer access permission management is efficient in dealing with existing problems in personal privacy and access permission management.

Password-based authenticated key agreement is widely used for systems that control remote access to computer networks. It has dual purposes of authentication and key agreement between two parties. Recently, Wang et al. were provided cryptanalysis focused on some attacks, especially for the password guessing attack, from a previous password-based authentication scheme and proposed a robust scheme to cope with the attacks. However, this paper points out that Wang et al.’s scheme has high computational overhead and proposes an anonymous password-based authenticated key agreement scheme with non-tamper resistant smart cards to reduce the overhead. The proposed scheme meets all the criteria required for the authenticated key agreement scheme and eliminates security threats.

This paper researches the authentication mechanism of Kerberos protocol under HDFS, and points out the problems that identity authentication mechanism of Kerberos protocol faced in HDFS cluster environment: time synchronization, KDC security, dictionary attacks and denial mechanism. Aiming at these security problems, firstly, this paper provides an overview of the authentication process of the current Kerberos protocol under HDFS cluster environment; secondly, it modifies Kerberos protocol by using public key encryption and data signature mechanism; lastly, it provides the authentication process of improved Kerberos protocol in HDFS environment. Comprehensive analysis shows that both safety and time efficiency of the improved Kerberos protocol are improved compared with the existing identity authentication mechanism. It provides a more reliable and efficient identity authentication solution for HDFS cluster.