| Abstract: | Examples of methods for generating data based on a communications channel
are described. In one such example, a processing unit may generate a
first vector representation based in part on at least two characteristics
of a communications channel. A constellation having at least two
dimensions may be addressed with the first vector representation to
identify a first symbol associated with the first vector representation.
The constellation represents a plurality of regions, each region
associated with a respective symbol. The symbol may be used to generate
data, which may stored in an electronic storage medium and used as a
cryptographic key or a spreading code or hopping sequence in a modulation
technique. |