{"id":8059,"date":"2026-08-19T11:11:30","date_gmt":"2026-08-19T09:11:30","guid":{"rendered":"https:\/\/viva.racunalniske-novice.com\/kako-lahko-potekle-brezsticne-kartice-ponovno-postanejo-placilno-sredstvo\/"},"modified":"2026-08-19T11:11:30","modified_gmt":"2026-08-19T09:11:30","slug":"kako-lahko-potekle-brezsticne-kartice-ponovno-postanejo-placilno-sredstvo","status":"publish","type":"post","link":"https:\/\/viva.racunalniske-novice.com\/de\/wie-konnen-abgelaufene-kontaktlose-karten-wieder-als-zahlungsmittel-verwendet-werden\/","title":{"rendered":"Wie k\u00f6nnen abgelaufene kontaktlose Karten wieder als Zahlungsmittel verwendet werden?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Experten der UMass Amherst University pr\u00e4sentierten eine Studie mit dem Titel \u201e<a href=\"https:\/\/www.usenix.org\/system\/files\/usenixsecurity26-anwar.pdf\">Zombie-Karten wieder online: Abgelaufene Kreditkarten f\u00fcr kontaktloses Bezahlen wiederbeleben<\/a>Darin wurde detailliert beschrieben, wie abgelaufene kontaktlose Zahlungskarten f\u00fcr Eink\u00e4ufe an Verkaufsstellen wiederverwendet werden k\u00f6nnen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kontaktloses Bezahlen basiert auf dem EMV-Protokoll. Dabei kommuniziert eine Karte oder ein Smartphone per NFC-Technologie mit einem Kassenterminal. Die Daten werden anschlie\u00dfend \u00fcber das Zahlungsnetzwerk an die Bank und den Kartenaussteller \u00fcbermittelt. Forscher warnen jedoch vor der Anf\u00e4lligkeit dieses Prozesses, da einige Daten unverschl\u00fcsselt zwischen Karte und Terminal \u00fcbertragen und erst sp\u00e4ter kryptografisch verifiziert werden.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Diese Sicherheitsl\u00fccke bietet Angriffsfl\u00e4che. Mithilfe zweier Smartphones, die als NFC-Proxy-Ger\u00e4te fungierten, f\u00fchrten die Forscher erfolgreich einen Man-in-the-Middle-Angriff durch. Sie stellten fest, dass kontaktlose Transaktionen im Visa-Netzwerk anf\u00e4llig f\u00fcr solche Angriffe sind, da ihnen ein ausreichender Schutz der Datenintegrit\u00e4t fehlt.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Das Problem liegt im sogenannten EMV-Kernprotokoll. W\u00e4hrend Mastercard, American Express und Discover strengere Regeln anwenden, ist das System von Visa \u201eoffener\u201c. Bei Visa-Karten ist das vom Terminal gelesene Ablaufdatum nicht kryptografisch durch eine digitale Signatur gesch\u00fctzt. Das Terminal pr\u00fcft zwar das Datum auf der Karte, die ausstellende Bank \u00fcberpr\u00fcft jedoch bei der Genehmigung eine weitere Datumsangabe. Da diese beiden Informationen nicht kryptografisch verkn\u00fcpft sind, kann ein Angreifer die vom Terminal w\u00e4hrend der \u00dcbertragung erfassten Informationen ver\u00e4ndern, w\u00e4hrend die anderen Sicherheitselemente scheinbar einwandfrei funktionieren.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ob der Angriff in der Praxis erfolgreich sein wird, h\u00e4ngt von der jeweiligen Bank und ihrer Transaktionsverarbeitung ab. Solche Erkenntnisse werfen jedoch berechtigterweise Zweifel daran auf, wie gr\u00fcndlich Finanzinstitute die Sicherheitsstandards pr\u00fcfen, bevor sie die Technologie fl\u00e4chendeckend einsetzen. Forschungsleiter Raja Hasnain Anwar erkl\u00e4rte, dass es sich hierbei um einen bewussten Kompromiss zwischen hohem Sicherheitsniveau und der Geschwindigkeit \u00e4lterer Terminals handele.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Die Autoren informierten Visa im Mai 2025 und erneut im Dezember 2025 \u00fcber die Sicherheitsl\u00fccke. Bis heute haben weder Visa noch eine der informierten Banken best\u00e4tigt, dass sie den Fehler behoben haben.<\/p>","protected":false},"excerpt":{"rendered":"<p>Strokovnjaki z ameri\u0161ke univerze UMass Amherst so na nedavni konferenci USENIX Security 2026 predstavili raziskavo z naslovom &#8220;Zombie Cards Back Online: Reviving Expired Credit Cards for Contactless Payments&#8220;. V njej so podrobno opisali na\u010din, kako je mogo\u010de potekle brezsti\u010dne pla\u010dilne kartice znova uporabiti za nakupovanje na prodajnih mestih. Brezsti\u010dno pla\u010devanje temelji na protokolu EMV, pri [&hellip;]<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[478,484],"class_list":["post-8059","post","type-post","status-publish","format-standard","hentry","tag-informacijska-varnost","tag-visa-kartica"],"acf":{"subtitle":"","heading":"","summary":"Raziskovalci so dokazali, da je z napadom NFC proxy mogo\u010de uporabiti potekle brezsti\u010dne kartice Visa. Zaradi odsotnosti kriptografske za\u0161\u010dite datuma poteka na kartici terminali spregledajo neveljavnost, kar omogo\u010da izvajanje nepoobla\u0161\u010denih pla\u010dil.","thumbnail_small":"https:\/\/racunalniske-novice.com\/wp-content\/uploads\/2026\/08\/ignartonosbg-visa-6947134_1920-560x315.jpg","thumbnail_large":"https:\/\/racunalniske-novice.com\/wp-content\/uploads\/2026\/08\/ignartonosbg-visa-6947134_1920-1024x683.jpg","thumbnail_caption":"Foto: Pixabay","gallery":"","video_gallery":null,"author":"","links":[{"title":"Usenix","url":"https:\/\/www.usenix.org\/system\/files\/usenixsecurity26-anwar.pdf"}],"sources":[{"title":"theregister","url":"https:\/\/www.theregister.com\/security\/2026\/08\/18\/expired-credit-cards-revived-by-researchers-to-make-unauthorized-payments\/5289229"}],"skip_language":[]},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Kako lahko potekle brezsti\u010dne kartice ponovno postanejo pla\u010dilno sredstvo? - Ra\u010dunalni\u0161ke novice<\/title>\n<meta name=\"description\" content=\"Raziskovalci so dokazali, da je z napadom NFC proxy mogo\u010de uporabiti potekle brezsti\u010dne kartice Visa. Zaradi odsotnosti kriptografske za\u0161\u010dite datuma poteka na kartici terminali spregledajo neveljavnos\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/viva.racunalniske-novice.com\/de\/wp-json\/wp\/v2\/posts\/8059\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Kako lahko potekle brezsti\u010dne kartice ponovno postanejo pla\u010dilno sredstvo? - Ra\u010dunalni\u0161ke novice\" \/>\n<meta property=\"og:description\" content=\"Strokovnjaki z ameri\u0161ke univerze UMass Amherst so na nedavni konferenci USENIX Security 2026 predstavili raziskavo z naslovom &#8220;Zombie Cards Back Online: Reviving Expired Credit Cards for Contactless Payments&#8220;. V njej so podrobno opisali na\u010din, kako je mogo\u010de potekle brezsti\u010dne pla\u010dilne kartice znova uporabiti za nakupovanje na prodajnih mestih. 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