The phrase "a disclosed data" is not correct in English.
The word "data" is typically treated as a plural noun, so it should be "disclosed data" without the article "a." You can use "disclosed data" when referring to information that has been made known or revealed, particularly in contexts involving privacy, security, or research.
Example: "The company is required to report any disclosed data to the regulatory authorities to ensure compliance with data protection laws."
Alternatives: "revealed data" or "released data".
It is useful to differentiate among the different types of variables in a disclosed data set.
We assume that a disclosed data set is a subset from a population data set.
In this section we illustrate why population uniqueness makes it easy to re-identify individuals in a disclosed data set.
In the US case a disclosed data set is often represented as a sample from the voter registration list and consequently the probability of re-identification would be measured differently.
A detailed review of the conditions for deciding whether it is likely that an adversary would know if an individual is in a disclosed data set or not was provided in a recent article [ 55].
It is also important to note some caveats to the practical application of our results by highlighting two assumptions: (a) a disclosed data set is a simple random sample from the population, and (b) the adversary does not know who is in the disclosed data set.
If the adversary finds a record in the disclosed data set with a female born in 1975 then the adversary will know with certainty it is Alice, and therefore Alice's record would be re-identified.
For example, the background knowledge may be available because the adversary knows a particular target individual in the disclosed data set, an individual in the data set has a visible characteristic that is also described in the data set, or the background knowledge exists in a public or semi-public registry.
The second type of disclosure is when an adversary learns something new about a patient in the disclosed data without knowing which specific record belongs to that patient.
Disclosed data: A frequent user activity on OSNs is to post information on one's wall (activities 2 and 11 in Figure 3).
The adversary was going to match the disclosed data set (a) against the voter list for re-identification purposes.
