1) Computation Cost: Now, we will analyze the computation cost of the SM and C in each algorithm. We have listed the
number of different operations in each algorithm, along with the simulated time of every algorithm in Table II. The symbol
Ce represents the modular exponentiation, and Cm represents the multiplication, Ch represents the hash operation, Ca represents the addition, and Cr represents the generation of random numbers. It is noted that the expression of h0 in Date Upload algorithm, upk and 1 in Trace algorithm are unnecessary to calculate again, as they are all public parameters.