Patent Document ID: 9984239
Application ID: 15058815

Base Claim:
1. A concealing apparatus comprising: one or more hardware processors configured to: generate a concealed text by concealing a plaintext with a concealing key; generate mapping information that is mapped to a keyword such that different mapping information is associated with each instance of the same keyword; generate a tag based on the keyword and the mapping information; and output the concealed text and the tag as a pair to external storage storing a plurality of concealed texts each of which is paired with a tag, wherein the tag is transmitted to the external storage when retrieving the concealed text.

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Claim 3:
3. The apparatus according to claim 1 , wherein the one or more hardware processors are further configured to output the keyword and the mapping information as a pair and to store the pair of the keyword and the mapping information in an internal storage that is accessible by a specific privileged user.