A Blockchain-Based Hierarchical Authentication Scheme for Multiserver Architecture

Table 8

Computation overhead comparison.

	Our scheme	Kou et al.’s scheme [2]	Ying and Nayak’s scheme [36]	Xiong et al.’s scheme [11]	He and Wang’s scheme [4]	Odelu et al.’s scheme [5]
Client	3 +  + 4 ≈ 1.3282	3 + 2 + +6 ≈ 5.2327	4 + 2 + 7 ≈1.7723	3 +  + 5 ≈1.3265	3 + 7 ≈1.3267	3 +  + 7 ≈1.3269
Server	3 +  + 6 ≈ 1.3284	2 +  + 4 +  + 7 +  ≈ 10.3348	4 + 2+3 ≈1.7719	4 + +5 ≈1.7685	3 + 5 ≈1.3265	2 + 2 + 6 ≈0.885
Total time (milliseconds)	≈2.6566	≈15.5675	≈3.5442	≈3.095	≈2.6532	≈2.2119