We present a new construction of anonymous hierarchical identity-based encryption (HIBE) over prime order groups. The distinct feature of our proposed scheme is that both private key and ciphertext have a constant size, which has never been achieved in all other existing anonymous HIBE schemes. Moreover, we utilized a double exponent technique to generate the ciphertext in order to provide anonymity. This simple and efficient method allows us to construct a more compact anonymous HIBE in prime order groups. Under the decisional bilinear n + 1-Diffie-Hellman exponent assumption and linear assumption, we show that the proposed scheme is secure and anonymous against chosen plaintext attacks in the standard model.
The anonymous HIBE scheme proposed in REF had a constant size of the private key and ciphertext.
Compact Anonymous Hierarchical Identity-Based Encryption with Constant Size Private Keys
Comput. J.
Comput. J.
Computer Science