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We applied clustering methods for security incident profiling. We consider<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M1\"><mml:mrow><mml:mi>K<\/mml:mi><\/mml:mrow><\/mml:math>-means, PAM, and CLARA clustering algorithms. For this purpose, we used data collected in Warden system from various security tools. We do not aim to differentiate between normal and abnormal network traffic, but we focus on grouping similar threat agents based on attributes of security events. We suggest a case of a fine classification and a case of a coarse classification and discuss advantages of both cases.<\/jats:p>","DOI":"10.1155\/2018\/3614093","type":"journal-article","created":{"date-parts":[[2018,3,25]],"date-time":"2018-03-25T19:30:47Z","timestamp":1522006247000},"page":"1-17","source":"Crossref","is-referenced-by-count":13,"title":["Network Intrusion Detection with Threat Agent Profiling"],"prefix":"10.1155","volume":"2018","author":[{"given":"Tom\u00e1\u0161","family":"Bajto\u0161","sequence":"first","affiliation":[{"name":"Faculty of Science, Pavol Jozef \u0160af\u00e1rik University in Ko\u0161ice, Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andrej","family":"Gajdo\u0161","sequence":"additional","affiliation":[{"name":"Faculty of Science, Pavol Jozef \u0160af\u00e1rik University in Ko\u0161ice, Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lenka","family":"Kleinov\u00e1","sequence":"additional","affiliation":[{"name":"Faculty of Science, Pavol Jozef \u0160af\u00e1rik University in Ko\u0161ice, Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1670-821X","authenticated-orcid":true,"given":"Katar\u00edna","family":"Lu\u010divjansk\u00e1","sequence":"additional","affiliation":[{"name":"Faculty of Science, Pavol Jozef \u0160af\u00e1rik University in Ko\u0161ice, Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1967-8802","authenticated-orcid":true,"given":"Pavol","family":"Sokol","sequence":"additional","affiliation":[{"name":"Faculty of Science, Pavol Jozef \u0160af\u00e1rik University in Ko\u0161ice, Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","reference":[{"key":"11","doi-asserted-by":"publisher","DOI":"10.1201\/b10867"},{"key":"43","doi-asserted-by":"publisher","DOI":"10.1007\/3-540-36084-0_7"},{"key":"10","doi-asserted-by":"publisher","DOI":"10.1016\/j.eswa.2005.05.002"},{"key":"9","doi-asserted-by":"publisher","DOI":"10.1016\/S1389-1286(98)00017-6"},{"key":"7","doi-asserted-by":"publisher","DOI":"10.1109\/comst.2015.2494502"},{"key":"20","doi-asserted-by":"publisher","DOI":"10.1016\/j.cose.2008.08.003"},{"journal-title":"International Journal of Data Mining &amp; 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