1. A method for embedding data in a biometric identifier, comprising: determining data to embed in the biometric identifier, wherein at least a portion of the data is based on a variable data stream; determining at least one control parameter that controls the generation of at least one biometric identifier feature, wherein the at least one control parameter is based on the determined data; generating the at least one biometric identifier feature based on the at least one determined control parameter; and including the at least one generated biometric identifier feature in the biometric identifier, such that the determined data is embedded in the biometric feature.