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In ciphertext policy attribute based encryption (ABE) schemes the sender selects an access structure and generates a ciphertext, which decryptors can get plaintext if he has certain set of secret key associate with his attributes which satisfies the access structure. On the other hand, many organisations already introduced standard identity based encryption (IBE) or public key encryption (PKE) where...
We are specifically concerned with scenarios in which multimedia data is stored once on the server and the same data is queried by multiple parties. We propose a framework for privacy preserving querying, in which encryption is performed only once, and the ciphertexts are stored on a database server. Rather than using public-key homomorphic cryptosystems, the parties querying the database first derive...
We propose an attribute-based cryptosystem in which decryption is conditional on the distance between attributes. Alice constructs a cipher text that consists of an encrypted message and a hidden attribute vector. Bob is able to decrypt Alice's message if and only if his attribute vector is within a specified maximum distance from Alice's attribute vector. We provide constructions for Euclidean and...
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