It tries to decrypt the random data using the corpus built on the original data.
so the end of the file looks like:
"Hesn’ed a tembers, ea ' mo byarrledMaelcallrlynwigr oysTold yo joinnt bnan twas The spwt?" aaoWe sastleenkeep had thein; aimaf it oneivof sv
TheeTssuterrcy oid,itng the shuri us d it m,
ed iroduone dga go toe s, mooerhae�er
"aot ofSsallR:58:40, in the darkn,erqwader t. "Whsne�ee thit wasaidfrenthct,nnto erut be�sRhe Hiesented onvery h Tsh thrs, at d tkly he on
upnbadarkn,eJls tat.iwheitu rs p.you ue, nC could seunnip on
Lo of its e put his p," theden, b��t te�ee thln’t tcept ofuicideBge fnoh me,sh yod aw to awyarrleomo. rare
Hutofases vred ve s"s. "Hicsuty sely’s lher uri and
watcosThe yfiile.cn,
aub, baelcumsemit wChcycleis the ��d taJ hair b"
so the end of the file looks like:
"Hesn’ed a tembers, ea ' mo byarrledMaelcallrlynwigr oysTold yo joinnt bnan twas The spwt?" aaoWe sastleenkeep had thein; aimaf it oneivof sv TheeTssuterrcy oid,itng the shuri us d it m, ed iroduone dga go toe s, mooerhae�er "aot ofSsallR:58:40, in the darkn,erqwader t. "Whsne�ee thit wasaidfrenthct,nnto erut be�sRhe Hiesented onvery h Tsh thrs, at d tkly he on upnbadarkn,eJls tat.iwheitu rs p.you ue, nC could seunnip on Lo of its e put his p," theden, b��t te�ee thln’t tcept ofuicideBge fnoh me,sh yod aw to awyarrleomo. rare Hutofases vred ve s"s. "Hicsuty sely’s lher uri and watcosThe yfiile.cn, aub, baelcumsemit wChcycleis the ��d taJ hair b"