Expressive Key-Policy Attribute-Based Encryption with Constant-Size Ciphertexts

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Provided by: Universite Bordeaux 1
Topic: Security
Format: PDF
Attribute-Based Encryption (ABE), as introduced by the researchers, allows for fine-grained access control on encrypted data. In its key-policy flavor, the primitive enables senders to encrypt messages under a set of attributes and private keys are associated with access structures that specify which ciphertexts the key holder will be allowed to decrypt. In most ABE systems, the ciphertext size grows linearly with the number of ciphertext attributes and the only known exceptions only support restricted forms of threshold access policies.
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