Research Article
B-SSMD: A Fine-Grained Secure Sharing Scheme of Medical Data Based on Blockchain
| | Scheme | Mainchain pressure | Blockchain structure | Security | Division granularity | Encryption mode |
| | Liu et al. [21] | ++ | Single | + | − | Public key | | Cao et al. [32] | + | Hybrid double | − | − | Hash | | Malamas et al. [34] | − | Hierarchical | + | + | CP-ABE | | Proposed scheme | − | Hybrid three | ++ | ++ | Three-layer |
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