Security Mechanism Based on Hospital Authentication Server for Secure Application of Implantable Medical Devices

Table 2

Performance comparisons.

2009	[6]		[9] w/PD			Proposed w/HAS
	IMD	Prog.	IMD	PD	Prog.	IMD	Prog.	HAS
Authentication/integrity	1 mac; (UniL)	1 mac; (UniL)	1 enc; 2 dec	1 enc; 1 ver	2 enc/1 dec; 1 sig	2 mac	4 mac	2 mac
SK generation/distribution	1 DH w/RBE	1 DH w/RBE	1 dec	1 Penc; 1 enc	1 Pdec	1 kdf	1 dec	1 kdf; 1 enc
No. msg	4 ·		IMP-PD: 1/PD-Prog.: 3; IMD-Prog.: 2			IMD-Prog.: 2/Prog.-HAS: 2
Patient data protection	N/A		N/A			1 enc; 1 hash	1 enc; 1 dec	1 hash; 1 dec
Treatment protection	N/A		N/A			N/A	1 sig	1 ver

PD: personal device; Prog.: programmer; No. msg: number of messages exchanged; mac: MAC function; UniL: unilateral authentication; RBE: rapid bit exchange; DH: Diffie-Hellman; hash: hash function; Penc: public-key encryption; Pdec: public-key decryption; enc: symmetric encryption; dec: symmetric decryption; kdf: key derivation function; sig: signature generation; ver: signature verification.