Systems and methods for generation of secure indexes for cryptographically-secure queries

A system, comprising:

• a data store;
• and
• at least one computing device in communication with the data store, the at least one computing device being configured to:
• receive data comprising a plurality of phrases;
• generate a plurality of secured versions of the plurality of phrases, wherein each of the plurality of secured versions corresponds to a respective one of the plurality of phrases;
• and
• generate a HiiT representative of the data received by:
• generating a first plurality of logical rows for a first logical table, each of the first plurality of logical rows having a respective row identifier for identification in a first column and a respective one of the plurality of secured versions in a second column, wherein the respective row identifier for each of the first plurality of logical rows comprises a randomly generated value or hash digest to hide a generation order of the first plurality of logical rows;
• and
• generating a second plurality of logical rows for a second logical table having a respective row identifier that is indistinguishable from random data, wherein each of the second plurality of logical rows comprises a link to a row of the first plurality of logical rows in the first logical table.

A method, comprising:

• receiving, via at least one computing device, data comprising a plurality of phrases;
• generating, via the at least one computing device, a plurality of secured versions of the plurality of phrases, wherein each of the plurality of secured versions corresponds to a respective one of the plurality of phrases;
• and
• generating, via the at least one computing device, a filter-gradient (FiG) tree representative of the data received by:
• generating a plurality of leaves, where individual ones of the plurality of leaves comprises to a respective one of the plurality of secured versions;
• and
• generating a plurality of nodes individually comprising one of a plurality of filter gradients, each of the plurality of filter gradients encoding a respective subset of the plurality of leaves.