A method of producing a digital multiple-level encoded image is presented.
The method comprises obtaining a digital authentication image, obtaining
a first encoding parameter set comprising one or more encoding
parameters, and constructing a first encoded image. The first encoded
image is constructed using a first encoding methodology, the digital
authentication image and the first encoding parameter set. The method
further comprises obtaining a second encoding parameter set comprising
one or more encoding parameters and constructing a second encoded image
using a second encoding methodology, the first encoded image and the
second encoding parameter set. The second encoded image may be decoded to
reveal the first encoded image using a decoder having characteristics
corresponding to at least a portion of the encoding parameters of the
second encoding parameter set. The first encoded image may be decoded to
reveal the authentication image using a decoder having characteristics
corresponding to at least a portion of the encoding parameters of the
first encoding parameter set.