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688 CHAPTER 27 Security and Privacy for Mobile Health-Care (m-Health) Systems NHIN Level 0 VHA RHIO 1 RHIO N Level 1 Level 2 VA clinics VA hospitals Region-1 non-VA hospitals/clinics Region-N non-VA hospitals/clinics Dr. White @ Clinic A SS (storage server) Dr. Black @ Hospital B PS (proxy signer/ delegation server) Level 3 FIGURE 27-2 Logic diagram of HIPS system hierarchy. consultation to the D-server in Event (10). Intu- itively, the S-server should mainly be responsible the security requirements of authenticity, confi- dentiality, data integrity, and availability.