1.Disposal of Data.
2.Clearing-overwriting-renders data in accessible by normal means.
3.Purging-degaussing-renders media unusable by normal means
4.Destruction - Physical destruction Irreversible by all known technique.
5.When physical destruction isn't possible, as in cloud environments,crypto-shredding provides the best means of sanitization.
6.Crypto-shredding requires the encryption of the data with a strong,publicly known algorithm and the destruction of the encryption key.
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