Efficient dynamic threshold identity-based encryption with constant-size ciphertext

Efficient Dynamic Data Encryption Algorithm for Mobile Ad Hoc Network

Two proper threshold broadcast encryption schemes are proposed for the mobile ad hoc network. The initial scheme achieves constant size private keys and O(n-t)-size ciphertexts. Under n+1-Decision Bilinear Diffie-Hellman Exponent (n+1-BDHE) assumption, it is provable security in the selective-identity model. Based on the dual system encryption, we propose our main construction. It also has cons...

Anonymous Constant-Size Ciphertext HIBE from Asymmetric Pairings

We present a new hierarchical identity based encryption (HIBE) scheme with constant-size ciphertext that can be implemented using the most efficient bilinear pairings, namely, Type-3 pairings. In addition to being fully secure, our scheme is anonymous. The HIBE is obtained by extending an asymmetric pairing based IBE scheme due to Lewko and Waters. The extension uses the approach of Boneh-Boyen...

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

Attribute-based encryption (ABE), as introduced by Sahai and Waters, 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 siz...

Hierarchical Identity Based Encryption with Constant Size Ciphertext

We present a Hierarchical Identity Based Encryption (HIBE) system where the ciphertext consists of just three group elements and decryption requires only two bilinear map computations, regardless of the hierarchy depth. Encryption is as efficient as in other HIBE systems. We prove that the scheme is selective-ID secure in the standard model and fully secure in the random oracle model. Our syste...

Chosen-ciphertext secure multi-hop identity-based conditional proxy re-encryption with constant-size ciphertexts