Table 2.

Security comparison.

Scheme	SF1	SF2	SF3	SF4	SF5	SF6	SF7	SF8	SF9
Jiang et al.	Yes	Yes	No	Yes	No	Yes	Yes	Yes	Yes
Wen et al.	Yes	Yes	No	Yes	No	Yes	No	No	No
Shin et al.	Yes	Yes	No	Yes	No	Yes	Yes	Yes	No
Gope and Hwang	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes
Farash et al.	Yes	No	No	Yes	No	Yes	Yes	Yes	Yes
Ours	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No