Research Article
B-SSMD: A Fine-Grained Secure Sharing Scheme of Medical Data Based on Blockchain
Table 1
Notations and their meanings.
| Notation | Meaning |
| | Medical record | | Patient | | Doctor | | Hospital | | User | | Patient information, doctor information | | Access control strategy | | Time | | Ciphertext | | IPFS path | | Attacker | | Key | | Attribute |
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