TY  - JOUR
A1  - Roschke, Sebastian
A1  - Cheng, Feng
A1  - Meinel, Christoph
T1  - High-quality attack graph-based IDS correlation
JF  - Logic journal of the IGPL
N2  - Intrusion Detection Systems are widely deployed in computer networks. As modern attacks are getting more sophisticated and the number of sensors and network nodes grow, the problem of false positives and alert analysis becomes more difficult to solve. Alert correlation was proposed to analyse alerts and to decrease false positives. Knowledge about the target system or environment is usually necessary for efficient alert correlation. For representing the environment information as well as potential exploits, the existing vulnerabilities and their Attack Graph (AG) is used. It is useful for networks to generate an AG and to organize certain vulnerabilities in a reasonable way. In this article, a correlation algorithm based on AGs is designed that is capable of detecting multiple attack scenarios for forensic analysis. It can be parameterized to adjust the robustness and accuracy. A formal model of the algorithm is presented and an implementation is tested to analyse the different parameters on a real set of alerts from a local network. To improve the speed of the algorithm, a multi-core version is proposed and a HMM-supported version can be used to further improve the quality. The parallel implementation is tested on a multi-core correlation platform, using CPUs and GPUs.
KW  - Correlation
KW  - attack graph
KW  - HMM
KW  - multi-core
KW  - IDS
Y1  - 2013
U6  - https://doi.org/10.1093/jigpal/jzs034
SN  - 1367-0751
VL  - 21
IS  - 4
SP  - 571
EP  - 591
PB  - Oxford Univ. Press
CY  - Oxford
ER  - 
TY  - JOUR
A1  - Momtazi, Saeedeh
A1  - Naumann, Felix
T1  - Topic modeling for expert finding using latent Dirichlet allocation
JF  - Wiley interdisciplinary reviews : Data mining and knowledge discovery
N2  - The task of expert finding is to rank the experts in the search space given a field of expertise as an input query. In this paper, we propose a topic modeling approach for this task. The proposed model uses latent Dirichlet allocation (LDA) to induce probabilistic topics. In the first step of our algorithm, the main topics of a document collection are extracted using LDA. The extracted topics present the connection between expert candidates and user queries. In the second step, the topics are used as a bridge to find the probability of selecting each candidate for a given query. The candidates are then ranked based on these probabilities. The experimental results on the Text REtrieval Conference (TREC) Enterprise track for 2005 and 2006 show that the proposed topic-based approach outperforms the state-of-the-art profile- and document-based models, which use information retrieval methods to rank experts. Moreover, we present the superiority of the proposed topic-based approach to the improved document-based expert finding systems, which consider additional information such as local context, candidate prior, and query expansion.
Y1  - 2013
U6  - https://doi.org/10.1002/widm.1102
SN  - 1942-4787
VL  - 3
IS  - 5
SP  - 346
EP  - 353
PB  - Wiley
CY  - San Fransisco
ER  -