IPFS-blockchain-based delegation model for internet of medical robotics things telesurgery system

Figures & data

Figure 1. System model.

Figure 2. Proposed protocol.

Figure 3. Multi-hop delegation process.

Table 1. Comparison of security properties.

properties	privacy preservation	fine-grained access control	collusion resistance	multi-hop delegation
Joshi et al. (2019)	√	√	×	×
Xu et al. (2019)	√	×	×	×
Wang et al. (2021)	√	√	×	√
The proposed	√	√	√	√

Table 2. Proposed protocol communication overhead.

Stages	Registration	delegation	Data storage $C_0$
Wang and Zhang (2020)	$(\mid S\mid +2)\mid G\mid$	$(2\mid L\mid +\mid S\mid +2)\mid G\mid$	$(\mid L\mid +3)\mid G\mid$
Deng et al. (2020)	$(2\mid S\mid +2)\mid G\mid$	$(2\mid S\mid +5)\mid G\mid$	$(3\mid L\mid +2)\mid G\mid +\mid G_T\mid$
The proposed	$(\mid S\mid +2)\mid G\mid$	$\mid Z_p^{\ast }\mid +\mid G_T\mid$	$(2\mid L\mid +2)\mid G\mid +\mid G_T\mid$

Table 3. Communication overhead of $C_1$,$C_2$ and $C_3$ ciphertexts.

Stages	Data sharing $C_1$	Data sharing $C_2$	Data sharing $C_3$
Wang and Zhang (2020)	$(4\mid L\mid +5)\mid G\mid +\mid G_T\mid$	$(6\mid L\mid +7)\mid G\mid +2\mid G_T\mid$	$(8\mid L\mid +9)\mid G\mid +3\mid G_T\mid$
Deng et al. (2020)	$4\mid G\mid +\mid G_T\mid$	–	–
The proposed	$(2\mid L\mid +2)\mid G\mid +\mid G_T\mid$	$(2\mid L\mid +2)\mid G\mid +\mid G_T\mid$	$(2\mid L\mid +2)\mid G\mid +\mid G_T\mid$

Table 4. Experimental parameters.

Parameter	Description
$\mid G\mid$	The bit length of an attribute found in group G
$\mid G_T\mid$	The bit length of an attribute found in group $G_T$
$\mid Z_p^{\ast }\mid$	The bit length of an attribute found in $Z_p^{\ast }$
$\mid S\mid$	The total number of users' attributes.
$\mid L\mid$	The attribute structure.

Figure 4. In-depth computational cost at delegatees.

Figure 5. Time consumption of transactions. (a) Transactions cost (b) Gas cost of transaction.

Figure 6. Computational cost comparison. (a) CC computation (b) patients computation (c) delegators computation and(d) delegatees computation.

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