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Message: <blockquote data-quote="x-pert" data-source="post: 2225481" data-attributes="member: 837">Not 100% correct machang. Shredder softwares commonly use DOD 5220.22-M  and Gutmann Algorithm to do that.It doesn't delete the file permenantly. Mama issella kiyuwa wage file ekak normaly delete karahama wenne eekata thiyana pointer eka delete wenawa. And eh memory eka aayith use karanna puluwan kiyala OS ekata kiyanawa. But eeta passe ehema memory ekak udin over write kalahama recover karanna baha lesiyen. But Government agencies like CIA, FBI have their techniques like Magnetic Force microscopic processes and image analysis to read the old data which is overwritten by some other data. Onna ohoma karana eka nawaththanna thamai DOD 5220.22-M  and Gutmann Algorithms thiyenne. Gutmann algo eken file eka uda 35 paarak over write karanawa using another sophisticated encryption method. So godak hard parana data hoyana eka. But widi naththema naha aayith recover karanna. Mokada oya okkoma algos use karanne symmetric crypto keys. <img src="/styles/default/xenforo/smilies/default/wink.gif"  class="smilie" loading="lazy" alt=";)" title="Wink    ;)" data-shortname=";)" /></blockquote>

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