A Comprehensive Survey on Local Differential Privacy

Table 3

The classification of privatization mechanisms.

Encoding method	Methods (protocols or mechanisms)
Direct encoding	GRR [36] (k-RR [35]), k-subset [41, 42]
Unary encoding	Baisc RAPPOR [7], one-time RAPPOR [7], k-RAPPOR [35], RAPPOR [7], O-RAPPOR [35], O-RR [35], OUE [36]
Local hashing	RMP(SHist) [37], OLH [36], SLH [40], HRR [10, 38], HR [39]