Attribute-based encryption for fine-grained access control of encrypted data
Proceedings of the 13th ACM conference on Computer and communications security
Ciphertext-Policy Attribute-Based Encryption
SP '07 Proceedings of the 2007 IEEE Symposium on Security and Privacy
Dual-Policy Attribute Based Encryption
ACNS '09 Proceedings of the 7th International Conference on Applied Cryptography and Network Security
PKC'11 Proceedings of the 14th international conference on Practice and theory in public key cryptography conference on Public key cryptography
Fuzzy identity-based encryption
EUROCRYPT'05 Proceedings of the 24th annual international conference on Theory and Applications of Cryptographic Techniques
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Dual-Policy Attribute Based Encryption (DP-ABE), proposed in 2009, is a combination of two variants, Ciphertext Policy-ABE (CP-ABE) and Key Policy-ABE (KP-ABE), where an encryptor can associate the data simultaneously with both a set of objective attributes and of subjective access policies. Or, a user is given a private key assigned simultaneously for both a set of objective attributes and a subjective access policy. A major problem of the above DP-ABE scheme is the ciphertext size linear to the number of attributes while the LSSS access structure can be assumed. We propose two novel DP-ABEs, which achieve constant-size ciphertext, regardless of the number of attributes in a logical AND data access policy with wildcards. We present two constructions: the first scheme under the q-Bilinear Diffie Hellman Exponent (q-BDHE) and the second scheme under the Decisional Bilinear-Diffie-Hellman assumptions (DBDH).