A Blockchain-Based User Authentication Scheme with Access Control for Telehealth Systems

Table 4

Security comparison.

Security requirements	[34]	[21]	[6]	Ours
Single registration	✓	✓	✓	✓
No online registration center	✓	✓	✓	✓
Mutual authentication	✓	✓	✓	✓
User anonymity	✓	✓	✓	✓
Untraceability	✓	✓	✓	✓
Session key agreement	✓	✓	✓	✓
Perfect forward secrecy	✓	✓	✓	✓
Two-factor security with PUF				✓
Access control	✓		✓	✓
Resistance of known attacks				✓