On the basis of studying the existing problems of power enterprise informatization at this stage, the paper introduces the application of data warehouse technology in power system, proposes to use enterprise-level data warehouse as the data centre, and describes the information of power enterprise based on data warehouse strategy The overall design of the system model; Finally, specific solutions and application examples are given for the design of the dimensional model of the power enterprise data warehouse.

Abstract-A convertible multi-authenticated encryption (CMAE) scheme allows a group of signers to cooperatively produce a valid authenticated encryption signature and still preserves the characteristic of convertible authenticated encryption (CAE) schemes. In 2008, Tsai proposed a CMAE scheme based on the intractability of one-way hash functions and discrete logarithms. However, we find that Tsai's scheme cannot provide the semantic security of the message and the computational efficiency of this scheme is rather high. In this paper, we propose a secure CMAE scheme, in which it enhances the semantic security of the message to overcome the defect in Tsai's scheme. Moreover, by compared with Tsai's scheme, the performance of the proposed scheme is more efficient than Tsai's in term of computational complexity.