Toward Privacy-Preserving Shared Storage in Untrusted Blockchain P2P Networks

Algorithm 1

Shared Storage of PHI Data.

1: Procedure  :

2: Trapdoor Function: (parent keys)trapdoor permutation function e.g. RSA, Rabin

3:

4:party has parent keys

5:

6:

7:

8:

9:

10: The sender creates a group of ring signature:

11: Procedure  use public key of the parties as an input

12: Create RS:

13:

14: AddNewMembers:in case: add new members

15:

16: end procedure

17: Procedure  the recipient creates stealth address

18:

19:

20:sender creates new OTP for recipient

21: end procedure

22: Procedure confidential ring signature as an option

23:True

24:

25:

26:  False

27: end procedure

28: Procedure  in this case, the PHI data is from the hospital

29:

30:

31:

32:KeyImage: to prevent storing the same data

33:

34: end procedure

35: Procedure

36:

37:

38:

39: Truetransaction is success

40:

41:

42:   False

43: End