Attribute-based encryption (ABE) is an emergent cryptographic primitive introduced in recent years. Due to its fine-grained access policy, ABE has been widely used in cloud security to build an ...attribute-based access control architecture. As a promising edge technology, Mobile Edge Computing (MEC), introduced for the Internet of Mobile Things (IoMT), provides the high quality services for the end-users with mobile IoT devices. In MEC, the data is stored and processed isolately and independently in fog nodes or cloudlets located at the edge of the Internet in the vicinity of the mobile users. But in most existing ABE schemes, researchers only consider there is a single data storage in the system. So this makes the existing ABE scheme not applicable for the MEC with distributed micro data storages. To solve this prominent challenge in traditional ABE, in this paper, we propose a fully decentralized outsourced ABE scheme (FDO-ABE) acted as the access control architecture for the MEC. Our FDO-ABE scheme, based on the non-interactive multi-authority ABE (NI-MA-ABE) scheme, not only supports the multi attribute authorities (AAs) in generating the multi attribute-based private keys for user, but also provides the independent and isolated ciphertext storage for the distributed cloudlets or fog nodes. What's more, to offload the computational intensive tasks from mobile devices, we design an efficient outsourced decryption (oDec) algorithm for our FDO-ABE scheme. By using our oDec algorithm, the complex operations in decryption phase can be transmitted from mobile IoT devices to the cloudlets. Summing up, our FDO-ABE scheme is more suitable as an access control model for MEC.
In this paper, an attribute-based encryption scheme with policy hidden and key tracing under multi-authority is proposed. In our scheme, the access structure is embedded into the ciphertext ...implicitly and the attacker cannot gain user's private information by access structure. The key traceability is realized under multi-authority and collusion is prevented. Finally, based on the DBDH security model, it is proved that this scheme can resist the plaintext attack under the standard model.
The 5G technology brings the substantial improvement on the quality of services (QoS), such as higher throughput, lower latency, more stable signal and more ultra-reliable data transmission, ...triggering a revolution for the wireless mobile network. But in a general traffic channel in the 5G-based wireless mobile network, an attacker can detect a message transmitted over a channel, or even worse, forge or tamper with the message. Building a secure channel over the two parties is a feasible solution to this uttermost data transmission security challenge in 5G-based wireless mobile network. However, how to authentication the identities of the both parties before establishing the secure channel to fully ensure the data confidentiality and integrity during the data transmission has still been a open issue. To establish a fully secure channel, in this paper, we propose a strongly secure pairing-free certificateless authenticated key agreement (PF-CL-AKA) protocol with two-way identity-based authentication before extracting the secure session key. Our protocol is provably secure in the Lippold model, which means our protocol is still secure as long as each party of the channel has at least one uncompromised partial private term. Finally, By the theoretical analysis and simulation experiments, we can observe that our scheme is practical for the real-world applications in the 5G-based wireless mobile network.
Although the steel price index plays a key role in finding price of steel, guiding and stabilizing the market, China still lacks a scientific, complete and rigorous steel price index. This paper ...firstly built the steel price index system, which considered different regions, steel products, materials and specifications. The index system consists of two index series and eight indexes. Then a calculation model of steel price index based on the Laspeyres method was constructed. Finally, an empirical analysis showed that the steel price index well reflected the price fluctuation and the predictive ability of price in the steel market.
By analyzing the pollution mode of urban environment system, this paper intends to establish a quantitative model system for calculating traffic environment carrying capacity (TECC). Moreover, after ...reviewing and analyzing the present research situation of traffic capacity, this paper classifies urban traffic capacity into macroUTC and microUTC, and quantitatively analyzes the former based on TECC. Finally, TECC and macroUTC model system is quantitatively and qualitatively applied respectively. The result of these applications displays that the model system proposed by this paper can be effectively used to control traffic development scale, seek for some appropriate approaches to improve urban ecological environment, meet the traffic environment control objective and realize the sustainable development of urban traffic eventually.
