BSSPD: A Blockchain-Based Security Sharing Scheme for Personal Data with Fine-Grained Access Control

Algorithm 7

SetSK.

 Input: account, sk

 Output: bool

1 ifmsg.sender is not _selfthen

2 throw;

3 else

4 u=ua_idx.find(account);

5 ifu!=nullthen

6  u.SK=sk

7  ua_idx.modify(u)

8  return true;

9 else

10  u.A=account;

11  u.SK=sk;

12  ua_idx.emplace(u)

13  return true;

14 end

15 end