An Intelligent and Secure Health Monitoring Scheme Using IoT Sensor Based on Cloud Computing

Table 4

The communication cost of our scheme.

Case	Cost
The case when hospital uploads physical inspection report
The case when mobile device uploads biological data
The emergency case
The normal case
Total

: the time to transmit the identity (80 bits).
: the time to transmit a timestamp (16 bits).
: the time to transmit a symmetric encryption, ciphertext (256 bits).
: the time to transmit an asymmetric encryption, ciphertext (1,024 bits).
: the time to transmit a signature (1024 bits).
: the time to transmit a certificate (8192 bits) [19].