A Metaheuristic Approach for Encrypting Blockchain Data Attributes Using Ciphertext Policy Technique

Table 3

The comparison of safety and performance.

Type of solution	User-level access control	Granularity	Data privacy	Key security distribution	Encryption/decryption key management
Scheme [7]	Symmetric encryption	✓	✓	X	X
Scheme [8]	Hash synchronization	X	X	—	—
Proposed scheme	Attribute-based encryption	✓	✓	✓	✓