AnonyControl: Control Cloud Data Anonymously with Multi-Authority Attribute-Based Encryption

Cloud computing is a revolutionary computing paradigm which enables flexible, on-demand and low-cost usage of computing resources. However, those advantages, ironically, are the causes of security and privacy problems, which emerge because the data owned by different users are stored in some cloud servers instead of under their own control. To deal with security problems, various schemes based on the Attribute- Based Encryption (ABE) have been proposed recently. However, the privacy problem of cloud computing is yet to be solved. This paper presents an anonymous privilege control scheme AnonyControl to address the user and data privacy problem in a cloud. By using multiple authorities in cloud computing system, our proposed scheme achieves anonymous cloud data access, finegrained privilege control, and more importantly, tolerance to up to (N -2) authority compromise. Our security and performance analysis show that AnonyControl is both secure and efficient for cloud computing environment.Comment: 9 pages, 6 figures, 3 tables, conference, IEEE INFOCOM 201

China Urban Poverty and its Contributing Factors, 1986-2000

poverty, China

Research on Food Safety Issues in the Catering Industry from the Perspective of Business Ethics

With the development of society, people’s requirements for food safety are rising. As a product of western economics, business ethics play a vital role in the development of an industry. This paper analyzes the current situation and causes of corruption in the catering industry from the perspective of business ethics and puts forward corresponding solutions. In order to solve this problem, we must work together in many ways and abide by the business ethics of the catering industry, so as to promote better and faster development of the catering industry

Polygonal vortex beams in quasi-frequency-degenerate states

We originally demonstrate the vortex beams with patterns of closed polygons [namely polygonal vortex beams (PVBs)] generated by a quasi-frequency-degenerate (QFD) Yb:CALGO laser resonator with astigmatic transformation. The PVBs with peculiar patterns of triangular, square, and parallelogram shapes carrying large orbital angular momentums (OAMs) are theoretically investigated and experimentally obtained in the vicinity of the SU(2) degenerate states of laser resonator. The PVBs in QFD states are compared with the vortex beams with patterns of isolated spots arrays located on the triangle-, square-, and parallelogram-shaped routes [namely polygonalspots-array vortex beams (PSA-VBs)] under normal SU(2) degenerate states. Beam profile shape of PVB or PSA-VB and OAM can be controlled by adjusting the cavity length and the position of pump spot. The simulated and experimental results validate the performance of our method to generate PVB, which is of great potential for promoting novel technologies in particle trapping and beam shaping

One-pot Synthesis of Novel Energy Materials: Sub-micron Fe2O3 Encapsuled Carbon Spheres Core-shell Composite

AbstractSub-micron Fe2O3 encapsuled carbon spheres core-shell composite (Fe2O3/C) has been successfully prepared through one-pot solvothermal reaction of acetylacetone and FeCl3 at 500°C. The phase and morphology of the sample were examined by XRD, TEM, SEM, HRTEM, XPS and TGA. Meanwhile, magnetic property of the sample was measured. Experimental results showed that the as-obtained Fe2O3/C composite with ferromagnetic property possesses excellent corrosion resistance against acid and alkali as well as high tolerable temperature (≤ 400°C). Potential applications are envisioned in many fields such as biotechnology, sensors, catalysis and especially, electrode materials for Fe-air battery, proton exchange membrane fuel cells (PEMFC), supercapacitor or Li-ion batter