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Ciphertext Policy Attribute-Based Encryption (CP-ABE) enforces expressive data access policies and each policy consists of a number of attributes. Most existing CP-ABE schemes incur a very large ciphertext size, which increases linearly with respect to the number of attributes in the access policy. Recently, Herranz <etal/> proposed a construction of CP-ABE with constant ciphertext. However,...
We consider the problem of minimizing a convex objective which is the sum of a smooth part and a non-smooth part. Inspired by various application, we focus on the case when the non-smooth part is a max function. In this paper, we consider to solve such problems using iterative smoothing-gradient methods. We conduct run-time complexity and convergence analysis of smoothing algorithms.
Mining correlation over steams attracts a lot of attentions recently. However, group correlation analysis over data streams is relatively few. Moreover, existing literatures are mainly focused on a single time window, with large space and time complexity. This paper proposes an online canonical correlation analysis algorithm called MGDS (Mining Group Data Streams). Based on base-window, the MGDS algorithm...
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