A Blockchain-Based Medical Data Sharing Mechanism with Attribute-Based Access Control and Privacy Protection

Algorithm 1

Mondrian partitioning algorithm.

Input: Table S to be partitioned.

Output: Partitioning result.

1: Anonymize(partition)

2: if (no allowable multidimensional cut for partition) then

3: return : partition summary

4: else

5: dim choose_dimension()

6: fs frequencySet(partition, dim)

7: splitVal find.median(fs)

8: lhs t partition: t.dim splitVal

9: rhs t partition: t.dim splitVal

10: return Anonymize(rhs) Anonymize(lhs)

11: end if