The invention discloses a recommendation
system-oriented high-concealment poisoning
attack detection method and application, and the method comprises the following steps: S1, user behavior and relationship modeling: constructing a user
feature vector and symbiotic relationship graph, and describing user scoring behavior preference and a co-occurrence relationship; s2, importance pre-screening: based on similarity measurement and importance modeling of
score distribution, filtering out normal users weakly related to potential
attack users; s3, cross-graph relation decoupling: carrying out key relation extraction and dynamic and static relation separation on the user
relation graph, and obtaining high-quality relation representation through a cross-graph
fusion mechanism; and S4, double-hyper-sphere cooperative detection: normal user representation is restrained by using a concentric hyper-sphere shell, and abnormal user detection is realized through the degree of deviation from the boundary. According to the method, high-concealment poisoning attacks can be effectively detected in a real recommendation
system environment, the detection accuracy is remarkably improved, the
false alarm rate is reduced, and the method has good practicability and robustness.