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| 1 | On the orders of transformation matrices (mod n) and two types of generalized Arnold transformation matrices显示文摘In this paper, we analyze the structure of the orders of matrices (mod n), and present the relation between the orders of matrices over finite fields and their Jordan normal forms. Then we generalize 2-dimensional Arnold transformation matrix to two types of n-dimensional Arnold transformation matrices: A-type Arnold transformation matrix and B-type transformation matrix, and analyze their orders and other properties based on our earlier results about the orders of matrices. | YANGLizhen CHENKefei | 2004 | Science in China(Series F)2004，47，5： | 5 |
| 2 | Cheater identifiable visual secret sharing scheme显示文摘The visual secret sharing scheme proposed by Naor and Shamir provides a way to encrypt a secret black-white image into shares. A qualified group of participants can recover the secret message without using any cryptographic computation. But the original scheme can easily be corrupted by malicious participant. We propose an extension of VSS(visual secret sharing) to identify cheaters before the secret is recovered. Without the need for any additional information and cryptographic computation, every participant can verify the validity of shares of other participants, thus the security of VSS is enhanced. | GanZhi ChenKefei | 2005 | Journal of Systems Engineering and Electronics2005，16，1： | 1 |
| 3 | Efficient Electronic Payment Fit for Wireless Network显示文摘David Chaum and Stefan Brands have proposed famous electronic cash schemes. Both schemes offer multi-party security as well as unconditional privacy of payments. We can see that Brands has managed to design a new kind of payment system without the inefficient features of Chaum's electronic cash while still matching most of the requirements placed on electronic cash. Brands' scheme uses simpler signature mechanisms,shorter messages and has smaller storage requirements,which make it very easy and feasible to implement in a wireless network. Both Chaum and Brands' electronic cash schemes are off-line electronic schemes. Unfortunately, to prevent Double-Spending from happening, the security of Brands' scheme relies heavily on the tamper-resistance device. The best way to prevent Double-Spending is to use some kind of on-line system.The on-line electronic payment system has been criticized mostly for its cost inefficiency and its inconvenience. But with the high developing speed of mobile techniques, many people like to use their mobile phone to navigate the Internet or send short messages, for example, NTT's Docomo.People nowadays like to be on-line everywhere and it is a trivial thing to require the user to be on-line when doing the electronic payment in the near future. This paper introduces an electronic payment system that implements Brands' efficient technology (restrictive blinding signature) into the user's mobile phone or user's PDA. The system is very efficient because of using restrictive blinding signature scheme and offers multi-party security as well as unconditional privacy of payments. This system has some features of on-line system, so it can prevent double-spending from happening. | HUANGZheng CHENKefei ZHENGDong | 2004 | Chinese Journal of Electronics2004，13，2： | 0 |
| 4 | Tracking image tampering by reverse processing显示文摘To enhance the performance of image authentication, a new fragile watermarking scheme, which exploits the perturbation in reverse processing, is proposed. In verifying the integrity of image contents, the method performs the reverse processing of watermarking. Typically, it de-filters the distributed version or solves an embedding equation instead of really extracting the watermark. If any tampering happened, the output should be perturbed violently because such processing enlarges the observation error, which can be regarded as the consequence of illegal manipulation. The drastically perturbed values imply the existence of tampering, and their positions directly draw the shapes of the manipulated areas. Compared with the mostly used block-based watermarking, the method localizes the tampering almost pixel-wise. It also supports the adaptive embedding, which keeps the perceptual quality better, and avoids the vulnerabilities resulting from the block-based approaches. | ChenKefei ZhaoXianfeng WangWeinong | 2005 | High Technology Letters2005，11，1： | 0 |
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