合法接受者从密文恢复出明文的过程称为（ ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69451' and id < 4497687 and id<>'4497687' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69451' and id > 4497687 and id<>'4497687' order by id asc limit 5