identity-based encryption 3 WBAN 2 authentication 2 e-health 2 Backward compatible 1 Ciphertexts 1 Cloud securities 1 Cloud storage 1 Encryption system 1 Identity Based Encryption 1 Internet of things 1 Internet-of-thing network security 1 IoT network security 1 Network security 1 Networks security 1 Private key 1 Public key cryptography 1 Public-key encryption 1 Revocation 1 article 1 cloud security 1 encryption 1 information storage 1 internet of things 1 network security 1 public key encryption 1 revocation 1