| http://www.w3.org/ns/prov#value | - By this way of expression, the operation of enciphering and deciphering a certain data item a using key K is expressed as DK(EK(a)), for example. [0040] In the embodiments, there is a case where a certain data item is first deciphered and then the deciphered data item is enciphered to restore the original data item.
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