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

Table 1

Security comparisons.

	[8]	[4]	[6]	[9]	Proposed
Security model	2-Tier	2-Tier	2-Tier	3-Tier w/PD	3-Tier w/HAS
Cryptographic method for authentication	Password	CR with; shared secret	CR with; shared secret	CR with; shared secret and signature	CR with; shared secret
Authentication type	Unilateral	Unilateral	Mutual	Unilateral	Mutual
SK generation	None	None	Diffie-; Hellman	PD; generates SK	HAS; generates SK
Key management	N/A	IMD-specific key from MK	N/A	PD maintains multiple PKs	RK and WK from LK
Multiple programmers	N/A	Insecure; support	Secure; support	Insecure; support	Secure; support
Patient data; protection	N/A	N/A	N/A	N/A	Secure; with
Treatment protection	N/A	N/A	N/A	N/A	Possible with; and

CR: challenge-response; PD: personal device; MK: master key; SK: session key; LK: long-term key; PK: public key; RK: Read-Key; WK: Write-Key.