Think of a question to which the answer is known only to you and your contact. Enter the question and answer, then wait for your contact to enter the answer. If the answers do not match, the communication channel you are using may be under surveillance.
Wumyslće sej prašenje, za kotrež wotmołwu jenož wy a waš kontakt znajetej. Zapodajće prašenje a wotmołwu a čakajće potom, doniž waš kontakt wotmołwu njezapodawa. Jeli sej wotmołwje njewotpowědujetej, so komunikaciski kanal, kotryž wužiwaće, snano wobkedźbuje.