selecting the schema for the word sequence;

partitioning the passcode into a plurality of bit groups;

determining at least one word category corresponding to at least one open category in the schema; and

replacing the least one open category in the schema with a word selected from the at least one word category, wherein the bit pattern assigned to the word matches a corresponding one of the plurality of bit groups, and wherein the at least one word category comprises a number of words corresponding to the number of bits in one of the plurality of bit groups.