1. A method, comprising: pretreating a textual message that includes a plurality of semantic sentences suitable for use in generating a sequence of binary bits, with each bit of the sequence of binary bits corresponding to a respective one of the semantic sentences; determining that a number of the plurality of semantic sentences in the textual message is of a sufficient number to carry a code, wherein the code includes one or more bits; selecting a subset of the plurality of semantic sentences to carry the code; embedding the code in the selected subset of the plurality of semantic sentences to generate a pattern of binary bits, wherein the pattern of binary bits corresponding to the selected subset of the plurality of semantic sentences matches a pattern of the one or more bits of the code; and tagging the selected subset of the plurality of semantic sentences.