Tracking the Insider Attacker: A Blockchain Traceability System for Insider Threats

. 2020 Sep 16;20(18):5297. doi: 10.3390/s20185297

Algorithm 5 Algorithm for traceability query.

Input: Query object:

o b j

Output: traceability information chain:

C 0

and

C 1

1:
while All $o b j$ have been queried on the privacy-chain do
2:
(Diffp(TDn), BHn) ← Find the $o b j$ on the privacy-chain, BH is the height of the block.
3:
Add (Diffp(TDn), BHn) to the $C 1$ .
4:
end while
5:
Then get a complete $C 1$ and Sort it by timestamp.
6:
$C 1$ = (Diffp(TD0),BH0)←(Diffp(TD1),BH1)←...← (Diffp(TDn), BHn).
7:
while All $o b j$ have been queried in $C 1$ do
8:
According to the (Diffp(TDn),BHn), Query data from its management node.
9:
The management node query TD from its self-chain based on BHn and its hash(TD).
10:
Add TDn to the $C 0$ .
11:
end while
12:
Then get a complete $C 0$ .
13:
$C 0$ = TD0←TD1←...←TDn.