{"id":26998,"date":"2026-09-27T20:02:20","date_gmt":"2026-09-27T18:02:20","guid":{"rendered":"https:\/\/www.itspy.cz\/thesis\/item-identifiability-from-large-language-models-basedembeddings-in-recommender-systems\/"},"modified":"2026-10-23T13:45:58","modified_gmt":"2026-10-23T11:45:58","slug":"item-identifiability-from-large-language-models-basedembeddings-in-recommender-systems","status":"publish","type":"thesis","link":"https:\/\/www.itspy.cz\/en\/thesis\/item-identifiability-from-large-language-models-basedembeddings-in-recommender-systems\/","title":{"rendered":"Item Identifiability from Large-Language-Models-Based\nEmbeddings in Recommender Systems"},"content":{"rendered":"<p>Large language models are increasingly used in recommender<br \/>\nsystems to generate item embeddings from textual metadata.<br \/>\nAlthough these embeddings are often treated as<br \/>\nprivacy-preserving, this thesis shows that they can still<br \/>\nreveal information about the underlying items. We study<br \/>\nitem-level identifiability and evaluate whether an attacker<br \/>\ncan identify the embedding model and match leaked item<br \/>\nembeddings to candidate items under different knowledge<br \/>\nscenarios. Experiments on MovieLens and Goodreads Books<br \/>\ndatasets show that semantics can be revealed through<br \/>\nembeddings, especially when titles or detailed descriptions<br \/>\nare available. We provide and evaluate a defence that<br \/>\nreduces the success of attacks.<\/p>\n","protected":false},"featured_media":26759,"template":"","meta":{"_acf_changed":false,"_links_to":"","_links_to_target":""},"university":[45,284,429],"thesis-year":[466],"class_list":["post-26998","thesis","type-thesis","status-publish","has-post-thumbnail","hentry","thesis-year-466"],"acf":{"autor":"Linda Bekov\u00e1","portret":"","vedouci":"Dr. rer. nat. Rodrigo Augusto Da Silva Alves"},"_links":{"self":[{"href":"https:\/\/www.itspy.cz\/en\/wp-json\/wp\/v2\/thesis\/26998","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.itspy.cz\/en\/wp-json\/wp\/v2\/thesis"}],"about":[{"href":"https:\/\/www.itspy.cz\/en\/wp-json\/wp\/v2\/types\/thesis"}],"version-history":[{"count":1,"href":"https:\/\/www.itspy.cz\/en\/wp-json\/wp\/v2\/thesis\/26998\/revisions"}],"predecessor-version":[{"id":27053,"href":"https:\/\/www.itspy.cz\/en\/wp-json\/wp\/v2\/thesis\/26998\/revisions\/27053"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.itspy.cz\/en\/wp-json\/wp\/v2\/media\/26759"}],"wp:attachment":[{"href":"https:\/\/www.itspy.cz\/en\/wp-json\/wp\/v2\/media?parent=26998"}],"wp:term":[{"taxonomy":"university","embeddable":true,"href":"https:\/\/www.itspy.cz\/en\/wp-json\/wp\/v2\/university?post=26998"},{"taxonomy":"thesis-year","embeddable":true,"href":"https:\/\/www.itspy.cz\/en\/wp-json\/wp\/v2\/thesis-year?post=26998"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}