A fully secure identity-based encryption scheme against chosen-ciphertext attack

Although getting a CPA secure IBE scheme is quite easy, achieving a fully secure IBE scheme against CCA is still a challenging problem nowadays. We get such a IBE scheme. First we propose a fully secure HIBE against CPA based on Waters´ IBE [23]. And then, as IBE is a special case of HIBE, we use Boneh´s result and technique [6] to construct a fully secure IBE against CCA.