The presently claimed invention relates generally to steganography and
fingerprinting or hashing. In one embodiment, a method includes:
obtaining a first set of plural-bit data, the first set of plural-bit
data corresponding to at least a portion of steganographically encoded
data in a media signal in the form of a digital watermark; obtaining a
second set of plural-bit data, the second set of pural-bit data
corresponding to a fingerprint or hash of the media signal. THe
fingerprint or hash includes a reduced-bit representation of the media
signal, and the first set of plural-bit data is not dependent on
information in the second set of plural-bit data. The method further
includes carrying out a first action associated with the first set of
plural-bit data; and carrying out a second action associated with the
second set of plural-bit data. Other embodiments are described and
claimed as well.