A Secure and Efficient Access Control Scheme for Shared IoT Devices over Blockchain

Table 2

The summary of functions about some access control schemes in the IoT environment.

Schemes	FSA1	FSA2	FSA3	FSA4	FSA5	FSA6	FSA7
[11]	✕	✕	✓	✕	✕	✕	✕
[17]	✓	✕	✕	✕	✓	✕	✓
[18]	✓	✕	✕	✓	✓	✓	✓
[23]	✓	✕	✓	✓	✓	✓	✕
[25]	✓	✕	✓	✕	✕	✕	✕
[26]	✓	✕	✕	✓	✕	✓	✕
[29]	✓	✕	✓	✓	✓	✓	✕
[30]	✓	✕	✓	✕	✕	✕	✕
[31]	✕	✓	✓	✕	✓	✕	✕
Ours	✓	✓	✓	✓	✓	✓	✓

FSAi (i = 1, …, 7) is the ith attribute. FSA1: whether mutual authentications occur with each other; FSA2: no need of a secure channel; FSA3: is it decentralized; FSA4: whether the key is negotiated; FSA5: whether to support mobility; FSA6: does the privacy be protected; FSA7: the gateway is not secure.