Search index

摘要

Method of searching comprising applying a function to individual elements within a digital work to form a set of index elements. Storing the index elements as an index for the digital work. Receiving a search term. Applying the function to one or more individual elements within the search term to convert the search term into one or more converted search term elements. Identifying a digital work having an index containing one or more index elements that match one or more of the converted search term elements. Returning search results of the identified digital work. Searchable index for a digital work formed by applying a function to individual elements within the digital work to form a set of index elements.

主权项

1. A method of searching encrypted digital works comprising the steps of:
applying an encryption function to individual elements within a digital work to form a set of encrypted index elements; storing the encrypted index elements as an index for the encrypted digital work, wherein storing the index elements comprises joining the index elements to form a single string and then separating the single string into an array of similar length data units and replicating a predetermined length of data components found in each data unit in the following data unit in the array; receiving a plain text search term; applying the encryption function to one or more individual elements within the search term to convert the search term into one or more encrypted search term elements; identifying an encrypted digital work having an index containing one or more encrypted index elements that match one or more of the encrypted search term elements; and returning search results of the identified encrypted digital work.