The presently claimed invention relates generally to methods and apparatus
associated with steganographic encoding (e.g., data hiding). One claim
recites a method including: obtaining plural-bit auxiliary information;
and during communication between a first computer and a second computer
over a network, modulating timing or phase of a clock signal generated by
the first computer so as to steganographically hide the plural-bit
auxiliary information in a communications signal sent between the first
computer and the second computer. Of course, other claims and
combinations are provided as well.