Some medical data, such as genome sequence data, is unique to an individual (where the uniqueness is partly dependent on the length of sequence data generated -

Some medical data, such as genome sequence data, is unique to an individual (where the uniqueness is partly dependent on the length of sequence data generated - short sequences may not be unique). Even worse, whole exome or genome data also describes your lineage and may reveal sensitive information about relatives, living and not. Deidentification of such genomic data is especially difficult.