Knwldg-bsd thntctn, cmmnly rfrrd t s KB, s mthd f thntctn whch sks t prv th dntty f smn ccssng srvc sch s fnncl nstttn r wbst. s th nm sggsts, KB rqrs th knwldg f prvt nfrmtn frm th ndvdl t prv tht th prsn prvdng th dntty nfrmtn s th wnr f th dntty. Thr r tw typs f KB: sttc KB, whch s bsd n pr-grd st f shrd scrts, nd dynmc KB, whch s bsd n qstns gnrtd frm wdr bs f prsnl nfrmtn.