Joachim Biskup Ulrich Flegel On Pseudonymization of Audit Data for Intrusion Detection. 161-180 2000 conf/diau/2000 Workshop on Design Issues in Anonymity and Unobservability http://link.springer.de/link/service/series/0558/bibs/2009/20090161.htm db/conf/diau/diau2000.html#BiskupF00