Huang et al. in [11] divided the privacy issues in health
monitoring systems into two categories: content oriented
privacy and contextual privacy. It is not difficult to withstand
not only the content oriented privacy attacks due to many
cryptographic techniques such as available encryption
algorithms. Contextual privacy means an adversary has the
ability to link the source and the destination of a message in the
system, if an adversary can link the patient with a specific
physician, then the patient privacy will be disclosed. This is
disclosure threats to break the secure transmission.