"This data must always be stored securely and never unencryptedly, i.e. never store this data in an unencrypted fashion"?
Is there an adverb for unencrypted?
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"Unencrypted" is not a verb, it is an adjective - it is modifying the noun "data".
The unencrypted data.
The verb form is "to encrypt", for which the preferred antonym is "decrypt" rather than "unencrypt".
So a better way to say this sentence would be:
This data must always be stored securely, never unencrypted.
although stylistically I don't like the double negative of "never unencrypted", it is still correct.