BtLckr s fll vlm ncryptn ftr ncldd wth Mcrsft Wndws vrsns strtng wth Wndws Vst. t s dsgnd t prtct dt by prvdng ncryptn fr ntr vlms. By dflt, t ss th dvncd ncryptn Stndrd (S) lgrthm n cphr blck chnng (CBC) r "xr–ncrypt–xr (XX)-bsd Twkd cdbk md wth cphrtxt Stlng" (XTS) md wth 128-bt r 256-bt ky. CBC s nt sd vr th whl dsk; t s ppld t ch ndvdl sctr.