If a user, whose attributes satisfy the old data access policy, does not decrypt old ciphertext before the policy update, he cannot obtain the data after the ciphertext is updated.
As a result, the long-term problem ``user can refuse to the update on his secret key if the policy update reduces his privilege" that hinders CP-ABE from being a practical network access control tool is overcome.
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However, due to the absence of the update function, CP-ABE has not been widely accepted as a complete access control tool.
In this paper, we add the update function for CP-ABE such that data access policy can be dynamically updated after the ciphertext is generated.
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Prices do not include postage and handling if applicable. Alzheimer’s disease (AD) and the behavioral variant of frontotemporal dementia (bv FTD) are the most common causes of dementia; however, their overlapping clinical syndromes and involved brain regions make a differential diagnosis difficult.First, we present a new linear secret sharing (LSS) matrix update algorithm based on existing LSS matrix generation algorithm.