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J.W.P.F. Kardaun | Leon Willenborg Cryptography as a tool to expand communications and ease of access
The higher awareness of the public and%5Egovenunents of the vulnerability of large data collections, have - at least in the Netherlands - given rise to increased requirements for the security measures of governmental data bases. Normally, stronger security measures are associated with more difficult and cumbersome access, and an increased burden for the legitimate users of data. Cryptographic techniques can be used however, to realize new ways of access and communication with the same or higher...
Non-fictie
Engels | 9 pagina's | CBS, Statistics Netherlands, Voorburg | 1999
Gedrukt boek
Leon Willenborg | J.W.P.F. Kardaun Fingerprints in microdata sets
The paper discusses a method - referred to as fingerprinting - that is used to find the "risky" records in a microdata set. The intuition on which the method rests is that records with many short unique combinations (in the file) of values of key variables are potentially dangerous, and should be identified for further processing. Identifying the risky records in a microdata set is the aim of fingerprinting. Once the risky records with (some of) their fingerprints have been identified, appropriate...
Non-fictie
Engels | 10 pagina's | CBS, Voorburg | 1999
Gedrukt boek
Leon Willenborg Optimization models for PRAM matrices
In this paper several optimization models are formulated to arrive at nonsingular PRAM matrices. Such, matrices can be used to modify a microdata set by the perturbation method for categorical variables called the Post Randomization Method (PRAM). Part of the paper is devoted to suitable (linear) criteria for assessing the safety of a PRAM-ed microdata set. The non-singularity of the resulting PRAM matrices is obtained by requiring the matrices to be dominant diagonal. Furthermore different objectives...
Non-fictie
Engels | 19 pagina's | CBS, Voorburg | 1999
Gedrukt boek