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Attribute-based encryption (ABE) with outsourced decryption not only enables fine-grained sharing of encrypted data, but also overcomes the efficiency drawback (in terms of ciphertext size and decryption cost) of the standard ABE schemes. In particular, an ABE scheme with outsourced decryption allows a third party (e.g., a cloud server) to transform an ABE ciphertext into a (short) El Gamal-type ciphertext...
The widespread use of mobile platforms for online multimedia on-the-go necessitates a secure and efficient multimedia authentication scheme catered for mobile devices. In this paper, we study the security of using existing content-based authentication schemes to efficiently protect the integrity of video streams while allowing content-preserving manipulations. We point out a common design flaw in...
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