Earticle

Proxy re-encryption (PRE) is a re-encryption technique to enable decryption of information encrypted with a delegator’s public key by using the delegatee’s private key. In existing PRE systems, there are restrictions to prevent delegation, delegatee, and proxy collusion. Therefore, a system to adjust the delegated decryption privilege using multi-proxy is required. This study defines a multi-proxy re-encryption technique based on quorum-controlled asymmetric PRE combined with a proxy that exceeds a threshold. Security weakness against collusion between proxy and delegatee can be prvented by applying such a technique, and re-encryption control by multi-proxy becomes possible.

In order to get a higher ranking, spam pages deceive the search engine using cheating technology, which will disturb the users to find useful information via search engine. The web spam is designed for search engines rather than for users, so it is important to make a distinction between the normal web pages and the web spam pages. The links of the normal web pages have a wide variety of sources and the content feature of the normal web pages are distributed regularly, while links source of the web spam pages is single and the content features of them are distributed disorderly. So after analyzing the link diversity and content features distribution of the web pages, a new web page ranking algorithm was proposed in this paper. In this method, the web pages ranking score is calculated by the TrustRank method combining web pages links diversity and the web pages content features. It can be shown from the experimental results that this method can effectively reduce spam pages ranking score.

With the development of economy and society, more and more attention has been paid to security of modern information service industry. This paper set up a security evaluation index system which is made up of 23 indexes from three perspectives of domestic environment, international competitiveness and external dependence of the industry. Besides, it also conducted a preliminary evaluation on security of China’s modern information service industry from 2007 to 2011 by adopting the method of principal component analysis. The composite scores are -3.66, -1.56, -1.09, 1.95 and 4.37 respectively while results of the varimax rotation show that important factors influencing security of China’s modern information service industry in recent years include return on sales, capital efficiency, labor productivity, macro environment and market demand growth rate. Therefore, from now on, we should promote security and development of modern information service industry through actively enhancing the domestic industrial environment and industrial competitiveness and effectively exerting control on the industry.

In this research, we presented another implanting calculation for QR Code Image Steganography and Text Hiding, which is based on 3-discrete wavelet transform (DWT) and improved RSA algorithm. Firstly, enter the text message and choose four random numbers for RSA encryption. After that, take four pictures: one is cover image and another is secret image. In the process of embedding, we divide RGB image into three planes: Red, Green and Blue. In this work, embed multiple color secret images into a single cover image for providing security. At last, encrypted text message is concealed into an embedded picture using Least significant bit (LSB). We evaluate performance on the basis of the peak signal noise ratio (PSNR) and structural similarity matrix (SSIM) with different varying weights. In this proposed, compared this algorithm to 1-DWT. In the extraction process, recover three secret image from stego image and decrypt text message.In this experiment, improved PSNR value as compared to previous paper. The experimental outcomes will be reached upto 84%. In our method, DWT is applied to decompose the cover image and produce the low and high frequency coefficients to take benefits of robustness and security goods.