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In many broadcast systems, it is useful to send messages to some (not all) members of the whole group. And the ciphertext can only be decrypted with the participation of a certain number of receivers. In this paper, we construct an efficient identity-based group-oriented threshold encryption scheme. The sender can encrypt a single message for a dynamic k-member group which can be a subset of the n-member...
In many broadcast systems, it is important to protect both distributed content and the identities of authorized recipients. But many systems fail to protect the privacy of their users. In this paper, we propose the first identity-based broadcast encryption scheme with recipient privacy, enables the efficient encryption of messages to multiple recipients without revealing the identities of authorized...
In this paper, we formalize the notion of identity-based broadcast group-oriented encryption scheme and present a construction for it based on Gentry??s IBE scheme. In our new scheme, the broadcaster could encrypt the message using the designated receive group??s identity and any receiver in the designated group can independently decrypt the ciphertext. The newly proposed scheme has the following...
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