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Adaptive Key Protection in Complex Cryptosystems with Attributes

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Figure

Figure 1: The time period ⟨5⟩ = 101 in (a) and the tree T101 in (b) associatedwith the time period ⟨5⟩ = 101, where the total number of time periods isN = 2d = 23.
Figure 2: The tree Tw, where “1-w1”, “2-w2”, · · · , “l-wl” are components ofa prefix w = w1w2 · · · wl (1 ≤ l ≤ d) of some time period
Figure 3: In the Compute-Next operation of ifs-ABE, the tree (T |corresponding toxwx)w, where is a leaf node of T , z is a node added above x to become the parent of xreplacing the former one y in the Key Generation algorithm, and “att(x)-1-1”, “att(x)-2-w2”, · · · , “att(x)-l-wl” are the components of w = w1w2 · · · wl x.
Figure 4: A subtree corresponding to the expiration time ⟨added to the access tree13⟩ = 1101 is T as a child of the root r of T , where (1,3), (2,2)are threshold gates.
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