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"Broadcast Authenticated Encryption with Keyword Search" by Xueqiao Liu, Kai He et al.

The emergence of public-key encryption with keyword search (PEKS) has provided an elegant approach to enable keyword search over encrypted content. Due to its high computational complexity proportional to the number of intended receivers, the trivial way of deploying PEKS for data sharing with multiple receivers is impractical, which motivates the development of a new PEKS framework for broadcast mode. However, existing works suffer from either the vulnerability to keyword guessing attacks (KGA) or high computation and communication complexity. In this work, a new primitive for keyword search in broadcast mode, named broadcast authenticated encryption with keyword search (BAEKS), is introduced, in which the sender not only encrypts the keyword but also authenticates it, eliminating the threats of KGA. Moreover, on top of keyword privacy, we formalize the notion of user anonymity (or key privacy) for BAEKS, which echoes the notion of key privacy for public-key encryption introduced by B ....

Roadcast Encryption , Keyword Guessing Attack , Multi User , Ublic Key Authenticated Encryption With Keyword Search ,

"Data Access Control in Cloud Computing: Flexible and Receiver Extendab" by Jianchang Lai, Fuchun Guo et al.

Abstract
Broadcast encryption provides a promising technique of data access control for specified users in cloud computing. A data uploader can generate a ciphertext for a set of chosen users such that only the intended users are able to learn the data content. However, with the rapidly increasing of collaboration between users, it is desired to extend the receiver set to grant the decryption right for more users. The existing broadcast encryption systems cannot be capable for this scenario. In this paper, we first take this problem into consideration and give a solution. We take the merits of identity-based cryptosystem and propose a notion of EIBBE: a flexible data access control with receiver extendable for cloud computing based on broadcast encryption. It allows the authorized receiver to extend the receiver set S stated in the ciphertext by adding a new receiver set $S $ without re-encryption. Both the users in S and $S $ can obtain the data successfully. The maximum numb ....

Access Control , Access Control , Roadcast Encryption , Cloud Computing , Eceiver Extendable , நுழைவு கட்டுப்பாடு ,