B-SSMD: A Fine-Grained Secure Sharing Scheme of Medical Data Based on Blockchain

Table 7

Security comparison.

Scheme	Liu et al. [21]	Cao et al. [32]	Malamas et al. [34]	Lee et al. [22]	Proposed scheme
Resistance to single-point failure	×	×	×	√	√
Resistance to impersonation	×	×	√	√	√
Resistance to replay attacks	×	×	×	√	√
Resistance to malicious tampering	√	√	√	√	√
User group members update	×	×	×	×	√