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Many ABE schemes support Threshold Cryptography in the sense that the policy that is used to share a random secret supports threshold gates. This is also not limited to Ciphertext-Policy ABE. Key-Policy ABE schemes also support threshold policies. The threshold policy is usually written with the of operator such as 2 of (attribute1, attribute2, ...


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To the best of my knowledge, many cloud storage systems are using ABE (Attribute Based Encryption) schemes. In this system they can encrypt data on the client side, using an “access structure” rather than “in the cloud” because the cloud is a third party server, so we do not trust it. That's why they are using the client side. Also, ABE is well suited for ...



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