{"id":254377,"date":"2026-08-18T17:59:00","date_gmt":"2026-08-18T15:59:00","guid":{"rendered":"https:\/\/www.itta.net\/?p=254377"},"modified":"2026-08-18T17:59:05","modified_gmt":"2026-08-18T15:59:05","slug":"how-to-spot-a-deepfake","status":"publish","type":"post","link":"https:\/\/www.itta.net\/en\/blog\/how-to-spot-a-deepfake\/","title":{"rendered":"How to Spot a Deepfake Before It Costs Your Company Millions"},"content":{"rendered":"<p><em>Une visioconf\u00e9rence truqu\u00e9e a suffi pour d\u00e9rober 25 millions de dollars au groupe Arup. Les deepfakes ne rel\u00e8vent plus de la science-fiction : ils visent d\u00e9sormais la tr\u00e9sorerie des entreprises, y compris en Suisse. Voici comment reconna\u00eetre un deepfake et le protocole qui prot\u00e8ge vos \u00e9quipes.<\/em><\/p>\n    <div class=\"quiz-ia-box\" id=\"quiz-ia\" data-lang=\"en\" data-read-label=\"Read the dedicated section\" data-color=\"#00B0AE\" data-color-light=\"#e6f9f9\" style=\"background:linear-gradient(135deg,#f8fcfc 0%,#f0fafa 100%);border-radius:12px;padding:32px 36px;margin:32px 0;border-left:6px solid #00B0AE;font-family:Montserrat,Arial,sans-serif;\">\r\n\r\n        <p style=\"font-size:1.5vw;font-weight:700;color:#00B0AE;margin:0 0 6px;line-height:1.4;\">Would your company survive a deepfake attack?<\/p>\r\n                    <p style=\"font-size:15px;color:#555;margin:0 0 24px;\">Five questions to assess your defenses against AI-powered fraud.<\/p>\r\n        \r\n                <div class=\"quiz-step\" data-step=\"1\" style=\"display:block;\">\r\n            <p style=\"font-size:16px;font-weight:700;color:#111;margin:0 0 14px;\">1 \/ 5 &mdash; Would an urgent transfer requested by your leadership over video go out without further checks?<\/p>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:8px;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q1\" value=\"2\" style=\"margin-right:10px;accent-color:#00B0AE;\">No, a callback on an official channel is mandatory            <\/label>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:8px;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q1\" value=\"1\" style=\"margin-right:10px;accent-color:#00B0AE;\">It depends on the amount            <\/label>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:8px;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q1\" value=\"0\" style=\"margin-right:10px;accent-color:#00B0AE;\">Yes, a request from leadership is enough            <\/label>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:0;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q1\" value=\"0\" style=\"margin-right:10px;accent-color:#00B0AE;\">I do not know our procedure            <\/label>\r\n            \r\n            <div class=\"quiz-nav\" style=\"display:flex;justify-content:flex-end;margin-top:16px;gap:8px;\">\r\n                                                    <button class=\"quiz-next\" data-next=\"2\" style=\"background:#00B0AE;color:#fff;border:none;padding:12px 24px;border-radius:8px;font-size:15px;font-weight:700;cursor:pointer;font-family:Montserrat,Arial,sans-serif;transition:opacity .15s;\">Next<\/button>\r\n                            <\/div>\r\n        <\/div>\r\n                <div class=\"quiz-step\" data-step=\"2\" style=\"display:none;\">\r\n            <p style=\"font-size:16px;font-weight:700;color:#111;margin:0 0 14px;\">2 \/ 5 &mdash; Do payments above a certain threshold require two approvals?<\/p>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:8px;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q2\" value=\"2\" style=\"margin-right:10px;accent-color:#00B0AE;\">Yes, without exception, even for executives            <\/label>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:8px;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q2\" value=\"1\" style=\"margin-right:10px;accent-color:#00B0AE;\">Yes, but leadership can override it            <\/label>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:8px;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q2\" value=\"0\" style=\"margin-right:10px;accent-color:#00B0AE;\">No, a single signature is enough            <\/label>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:0;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q2\" value=\"0\" style=\"margin-right:10px;accent-color:#00B0AE;\">No threshold has been defined            <\/label>\r\n            \r\n            <div class=\"quiz-nav\" style=\"display:flex;justify-content:space-between;margin-top:16px;gap:8px;\">\r\n                                    <button class=\"quiz-prev\" data-prev=\"1\" style=\"background:#fff;color:#333;border:2px solid #ddd;padding:12px 24px;border-radius:8px;font-size:15px;font-weight:700;cursor:pointer;font-family:Montserrat,Arial,sans-serif;transition:border-color .15s;\">Previous<\/button>\r\n                                                    <button class=\"quiz-next\" data-next=\"3\" style=\"background:#00B0AE;color:#fff;border:none;padding:12px 24px;border-radius:8px;font-size:15px;font-weight:700;cursor:pointer;font-family:Montserrat,Arial,sans-serif;transition:opacity .15s;\">Next<\/button>\r\n                            <\/div>\r\n        <\/div>\r\n                <div class=\"quiz-step\" data-step=\"3\" style=\"display:none;\">\r\n            <p style=\"font-size:16px;font-weight:700;color:#111;margin:0 0 14px;\">3 \/ 5 &mdash; Have your teams ever heard an AI-cloned voice during training?<\/p>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:8px;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q3\" value=\"2\" style=\"margin-right:10px;accent-color:#00B0AE;\">Yes, with hands-on exercises            <\/label>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:8px;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q3\" value=\"1\" style=\"margin-right:10px;accent-color:#00B0AE;\">The topic was mentioned, without a demo            <\/label>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:8px;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q3\" value=\"0\" style=\"margin-right:10px;accent-color:#00B0AE;\">No, never            <\/label>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:0;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q3\" value=\"1\" style=\"margin-right:10px;accent-color:#00B0AE;\">Only the IT team has been briefed            <\/label>\r\n            \r\n            <div class=\"quiz-nav\" style=\"display:flex;justify-content:space-between;margin-top:16px;gap:8px;\">\r\n                                    <button class=\"quiz-prev\" data-prev=\"2\" style=\"background:#fff;color:#333;border:2px solid #ddd;padding:12px 24px;border-radius:8px;font-size:15px;font-weight:700;cursor:pointer;font-family:Montserrat,Arial,sans-serif;transition:border-color .15s;\">Previous<\/button>\r\n                                                    <button class=\"quiz-next\" data-next=\"4\" style=\"background:#00B0AE;color:#fff;border:none;padding:12px 24px;border-radius:8px;font-size:15px;font-weight:700;cursor:pointer;font-family:Montserrat,Arial,sans-serif;transition:opacity .15s;\">Next<\/button>\r\n                            <\/div>\r\n        <\/div>\r\n                <div class=\"quiz-step\" data-step=\"4\" style=\"display:none;\">\r\n            <p style=\"font-size:16px;font-weight:700;color:#111;margin:0 0 14px;\">4 \/ 5 &mdash; Have you agreed on control questions only your real executives can answer?<\/p>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:8px;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q4\" value=\"2\" style=\"margin-right:10px;accent-color:#00B0AE;\">Yes, they are defined and known to key people            <\/label>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:8px;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q4\" value=\"1\" style=\"margin-right:10px;accent-color:#00B0AE;\">No, but we would improvise if needed            <\/label>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:8px;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q4\" value=\"0\" style=\"margin-right:10px;accent-color:#00B0AE;\">No, we trust the voice and the face            <\/label>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:0;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q4\" value=\"0\" style=\"margin-right:10px;accent-color:#00B0AE;\">I am discovering the idea right now            <\/label>\r\n            \r\n            <div class=\"quiz-nav\" style=\"display:flex;justify-content:space-between;margin-top:16px;gap:8px;\">\r\n                                    <button class=\"quiz-prev\" data-prev=\"3\" style=\"background:#fff;color:#333;border:2px solid #ddd;padding:12px 24px;border-radius:8px;font-size:15px;font-weight:700;cursor:pointer;font-family:Montserrat,Arial,sans-serif;transition:border-color .15s;\">Previous<\/button>\r\n                                                    <button class=\"quiz-next\" data-next=\"5\" style=\"background:#00B0AE;color:#fff;border:none;padding:12px 24px;border-radius:8px;font-size:15px;font-weight:700;cursor:pointer;font-family:Montserrat,Arial,sans-serif;transition:opacity .15s;\">Next<\/button>\r\n                            <\/div>\r\n        <\/div>\r\n                <div class=\"quiz-step\" data-step=\"5\" style=\"display:none;\">\r\n            <p style=\"font-size:16px;font-weight:700;color:#111;margin:0 0 14px;\">5 \/ 5 &mdash; Is an employee who delays a payment to verify it backed by your company culture?<\/p>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:8px;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q5\" value=\"2\" style=\"margin-right:10px;accent-color:#00B0AE;\">Yes, this right to doubt is written down and endorsed            <\/label>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:8px;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q5\" value=\"1\" style=\"margin-right:10px;accent-color:#00B0AE;\">In principle yes, but nothing is formalized            <\/label>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:8px;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q5\" value=\"0\" style=\"margin-right:10px;accent-color:#00B0AE;\">No, urgency always comes first            <\/label>\r\n                        <label style=\"display:block;padding:12px 16px;margin-bottom:0;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;font-size:15px;color:#333;transition:border-color .15s,background .15s;\">\r\n                <input type=\"radio\" name=\"q5\" value=\"0\" style=\"margin-right:10px;accent-color:#00B0AE;\">The question has never come up            <\/label>\r\n            \r\n            <div class=\"quiz-nav\" style=\"display:flex;justify-content:space-between;margin-top:16px;gap:8px;\">\r\n                                    <button class=\"quiz-prev\" data-prev=\"4\" style=\"background:#fff;color:#333;border:2px solid #ddd;padding:12px 24px;border-radius:8px;font-size:15px;font-weight:700;cursor:pointer;font-family:Montserrat,Arial,sans-serif;transition:border-color .15s;\">Previous<\/button>\r\n                                                    <button id=\"quiz-ia-submit\" style=\"background:#00B0AE;color:#fff;border:none;padding:12px 24px;border-radius:8px;font-size:15px;font-weight:700;cursor:pointer;font-family:Montserrat,Arial,sans-serif;transition:opacity .15s;\">See my result<\/button>\r\n                            <\/div>\r\n        <\/div>\r\n        \r\n        <div id=\"quiz-ia-result\" style=\"display:none;\"><\/div>\r\n\r\n    <\/div>\r\n    \n<h2 id=\"sommaire\">Sommaire<\/h2>\n<ol>\n<li><a href=\"#menace-reelle\">Du gadget au braquage num\u00e9rique : ce qui a chang\u00e9<\/a><\/li>\n<li><a href=\"#suisse-cible\">Pourquoi les entreprises suisses sont des cibles de choix<\/a><\/li>\n<li><a href=\"#trois-attaques\">Les trois visages de l&#8217;arnaque deepfake<\/a><\/li>\n<li><a href=\"#signaux\">Les signaux qui trahissent une imitation<\/a><\/li>\n<li><a href=\"#protocole\">Le protocole anti-deepfake \u00e0 instaurer d\u00e8s demain<\/a><\/li>\n<li><a href=\"#former\">Former vos \u00e9quipes : le pare-feu humain<\/a><\/li>\n<li><a href=\"#conclusion\">Conclusion<\/a><\/li>\n<li><a href=\"#faq-deepfake\">FAQ<\/a><\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/deepfake-visioconference-entreprise-1.webp\" alt=\"dirigeant analysant une visioconf\u00e9rence suspecte de deepfake\" width=\"1584\" height=\"672\" loading=\"lazy\" \/><\/p>\n<p>Imaginez la sc\u00e8ne. Votre responsable financier re\u00e7oit une invitation \u00e0 une visioconf\u00e9rence confidentielle. \u00c0 l&#8217;\u00e9cran, le directeur financier du groupe, entour\u00e9 de plusieurs coll\u00e8gues connus. Les visages sont justes, les voix aussi. On lui demande d&#8217;ex\u00e9cuter une s\u00e9rie de virements urgents. Il s&#8217;ex\u00e9cute. Sauf que personne, dans cette r\u00e9union, n&#8217;\u00e9tait r\u00e9el. Ce sc\u00e9nario n&#8217;a rien d&#8217;hypoth\u00e9tique. Il s&#8217;est produit, et il a co\u00fbt\u00e9 25 millions de dollars. Pendant ce temps, beaucoup d&#8217;entreprises romandes voient encore le deepfake comme un divertissement pour r\u00e9seaux sociaux. Cette insouciance est exactement ce sur quoi comptent les fraudeurs. La bonne nouvelle ? Reconna\u00eetre un deepfake reste possible. Encore faut-il savoir o\u00f9 regarder et, surtout, installer quelques r\u00e9flexes simples. D\u00e9cortiquons la menace, puis construisons votre d\u00e9fense.<\/p>\n<h2 id=\"menace-reelle\">Du gadget au braquage num\u00e9rique : ce qui a chang\u00e9<\/h2>\n<p>Le 4 f\u00e9vrier 2024, la police de Hong Kong r\u00e9v\u00e8le une affaire qui fera date. Un employ\u00e9 du bureau local d&#8217;Arup vire 200 millions de dollars de Hong Kong \u00e0 des escrocs. Cela repr\u00e9sente environ 25,6 millions de dollars am\u00e9ricains, envol\u00e9s en quinze virements sur une seule journ\u00e9e. La victime ? Le groupe d&#8217;ing\u00e9nierie britannique qui a sign\u00e9 l&#8217;op\u00e9ra de Sydney. Le levier ? Une visioconf\u00e9rence enti\u00e8re reconstitu\u00e9e par IA, comme l&#8217;a d\u00e9taill\u00e9 <a href=\"https:\/\/www.cnn.com\/2024\/05\/16\/tech\/arup-deepfake-scam-loss-hong-kong-intl-hnk\" target=\"_blank\" rel=\"noopener noreferrer\">CNN<\/a>. Le directeur financier et plusieurs coll\u00e8gues pr\u00e9sents \u00e0 l&#8217;\u00e9cran \u00e9taient des deepfakes. Les fraudeurs les avaient fabriqu\u00e9s \u00e0 partir de vid\u00e9os publiques. Les fonds n&#8217;ont jamais \u00e9t\u00e9 retrouv\u00e9s.<\/p>\n<p>Ce cas embl\u00e9matique n&#8217;est pas isol\u00e9. Deloitte a sond\u00e9 plus de 1 100 dirigeants et cadres sur le sujet. R\u00e9sultat : <a href=\"https:\/\/www.prnewswire.com\/news-releases\/half-of-executives-expect-more-deepfake-attacks-on-financial-and-accounting-data-in-year-ahead-302250391.html\" target=\"_blank\" rel=\"noopener noreferrer\">25,9 % des organisations ont d\u00e9j\u00e0 subi au moins un incident deepfake<\/a> visant leurs donn\u00e9es financi\u00e8res ou comptables sur douze mois. La moiti\u00e9 des r\u00e9pondants s&#8217;attendait en outre \u00e0 une hausse de ces attaques. Autrement dit, un quart des entreprises interrog\u00e9es a d\u00e9j\u00e0 crois\u00e9 cette menace. Le deepfake a quitt\u00e9 le rayon des curiosit\u00e9s. Il fait d\u00e9sormais partie de l&#8217;arsenal standard de la fraude au pr\u00e9sident.<\/p>\n<h2 id=\"suisse-cible\">Pourquoi les entreprises suisses sont des cibles de choix<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/cybersecurite-entreprises-suisses-1.webp\" alt=\"statistiques de cybers\u00e9curit\u00e9 des entreprises suisses\" width=\"1584\" height=\"672\" loading=\"lazy\" \/><\/p>\n<p>La Suisse cumule les facteurs qui attirent les fraudeurs. Les entreprises y sont solvables, les flux financiers internationaux et les montants \u00e9lev\u00e9s. Le tissu \u00e9conomique repose en outre sur des PME o\u00f9 les contr\u00f4les restent souvent informels. Les chiffres officiels confirment la pression. L&#8217;Office f\u00e9d\u00e9ral de la cybers\u00e9curit\u00e9 a re\u00e7u <a href=\"https:\/\/www.ncsc.admin.ch\/ncsc\/fr\/home\/aktuell\/im-fokus\/2025\/wochenrueckblick_52.html\" target=\"_blank\" rel=\"noopener noreferrer\">pr\u00e8s de 65 000 annonces de cyberincidents en 2025<\/a>. Surtout, la fraude au CEO progresse nettement : 970 signalements en 2025, contre 719 l&#8217;ann\u00e9e pr\u00e9c\u00e9dente. Cette hausse d&#8217;un tiers en un an donne la tendance.<\/p>\n<p>Or, cette fraude au pr\u00e9sident change pr\u00e9cis\u00e9ment de visage avec l&#8217;IA. Hier, il s&#8217;agissait d&#8217;un simple courriel imitant la signature du patron. Aujourd&#8217;hui, l&#8217;OFCS d\u00e9crit des campagnes bien plus sophistiqu\u00e9es. Des personnalit\u00e9s connues y apparaissent dans de fausses interviews, enti\u00e8rement g\u00e9n\u00e9r\u00e9es par IA, pour vanter des placements miracles. La m\u00eame m\u00e9canique s&#8217;applique aux dirigeants d&#8217;entreprise. Quelques minutes de prise de parole publique suffisent \u00e0 cloner une voix et un visage. Une keynote, un podcast ou une vid\u00e9o LinkedIn fournissent toute la mati\u00e8re premi\u00e8re n\u00e9cessaire. De ce fait, plus votre direction est visible, plus votre entreprise devient facile \u00e0 imiter. Les PME ne sont pas \u00e9pargn\u00e9es, bien au contraire. Elles sont vis\u00e9es en priorit\u00e9, car leurs validations de paiement reposent souvent sur la confiance plut\u00f4t que sur des proc\u00e9dures \u00e9crites.<\/p>\n<h2 id=\"trois-attaques\">Les trois visages de l&#8217;arnaque deepfake<\/h2>\n<p>Toutes les attaques par deepfake ne se ressemblent pas. En pratique, trois sc\u00e9narios dominent largement le terrain. Chacun a son canal et sa cible privil\u00e9gi\u00e9e.<\/p>\n<div style=\"max-width:100%;width:100%;margin:1rem 0 0.5rem 0\">\n<table style=\"width:100%\">\n<thead>\n<tr>\n<th>Sc\u00e9nario<\/th>\n<th>Canal<\/th>\n<th>Objectif<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Visioconf\u00e9rence truqu\u00e9e<\/td>\n<td>Teams, Zoom, lien externe<\/td>\n<td>Faire valider des virements urgents par la finance<\/td>\n<\/tr>\n<tr>\n<td>Voix clon\u00e9e au t\u00e9l\u00e9phone<\/td>\n<td>Appel ou message vocal WhatsApp<\/td>\n<td>Obtenir un paiement, un acc\u00e8s ou des donn\u00e9es sensibles<\/td>\n<\/tr>\n<tr>\n<td>Fausse vid\u00e9o publique<\/td>\n<td>R\u00e9seaux sociaux, publicit\u00e9s<\/td>\n<td>Escroquer clients et employ\u00e9s avec l&#8217;image de la marque<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Le premier sc\u00e9nario, celui d&#8217;Arup, reste le plus spectaculaire. Le deuxi\u00e8me est toutefois le plus fr\u00e9quent, car il demande moins de pr\u00e9paration. Trente secondes de voix suffisent \u00e0 entra\u00eener un clone convaincant. L&#8217;attaque arrive souvent par un message vocal WhatsApp, un canal peu surveill\u00e9 par les \u00e9quipes de s\u00e9curit\u00e9. Le troisi\u00e8me sc\u00e9nario ne vise pas votre caisse directement, mais votre r\u00e9putation. Vos clients perdent de l&#8217;argent en croyant r\u00e9pondre \u00e0 votre dirigeant, et votre marque paie les d\u00e9g\u00e2ts. Dans les trois cas, le mode op\u00e9ratoire combine urgence, confidentialit\u00e9 et autorit\u00e9 hi\u00e9rarchique. C&#8217;est ce triangle qu&#8217;il faut apprendre \u00e0 rep\u00e9rer.<\/p>\n<h2 id=\"signaux\">Les signaux qui trahissent une imitation<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/signaux-detection-deepfake-1.webp\" alt=\"analyste rep\u00e9rant les signaux visuels d&apos;un deepfake \u00e0 l&apos;\u00e9cran\" width=\"1584\" height=\"672\" loading=\"lazy\" \/><\/p>\n<p>Les g\u00e9n\u00e9rateurs progressent vite, mais ils laissent encore des traces. Votre \u0153il et votre oreille peuvent les capter, \u00e0 condition de savoir quoi chercher.<\/p>\n<h3>Les indices visuels en visioconf\u00e9rence<\/h3>\n<p>Observez d&#8217;abord les zones que les mod\u00e8les g\u00e8rent mal. Le contour du visage flotte parfois lors des mouvements rapides. La synchronisation entre les l\u00e8vres et le son d\u00e9cale d&#8217;une fraction de seconde. Les clignements d&#8217;yeux paraissent trop r\u00e9guliers, ou manquent carr\u00e9ment. Les lunettes, les boucles d&#8217;oreilles et les cheveux fins produisent souvent des scintillements. Par ailleurs, demandez un geste impr\u00e9vu \u00e0 votre interlocuteur. Tourner la t\u00eate de profil ou passer la main devant le visage fait d\u00e9crocher la plupart des syst\u00e8mes en temps r\u00e9el.<\/p>\n<h3>Les indices audio au t\u00e9l\u00e9phone<\/h3>\n<p>Une voix clon\u00e9e pr\u00e9sente fr\u00e9quemment une prosodie l\u00e9g\u00e8rement plate. Les \u00e9motions arrivent en retard ou tombent \u00e0 c\u00f4t\u00e9. M\u00e9fiez-vous aussi des latences inhabituelles entre vos questions et les r\u00e9ponses. Des respirations absentes et des bruits de fond trop propres compl\u00e8tent le tableau. En cas de doute, changez brusquement de sujet. Vous pouvez aussi poser une question personnelle inattendue : les scripts frauduleux supportent mal l&#8217;improvisation.<\/p>\n<h3>Les indices comportementaux, les plus fiables<\/h3>\n<p>Finalement, les signaux les plus robustes ne sont ni visuels ni sonores. M\u00e9fiez-vous d&#8217;un dirigeant qui exige un virement imm\u00e9diat et impose le secret absolu. S&#8217;il refuse en plus tout rappel sur un canal officiel, toutes les cases de la fraude sont coch\u00e9es, avec ou sans IA. L&#8217;urgence artificielle reste la signature de l&#8217;escroquerie. La technologie change, le levier psychologique demeure.<\/p>\n\n<figure class=\"wp-block-image size-large itta-cta-banner\" style=\"margin:2.75rem 0\"><a href=\"https:\/\/www.itta.net\/formations\/intelligence-artificielle\/comprendre-lintelligence-artificielle\/comprendre-intelligence-artificielle-en-entreprise\/\" target=\"_blank\" rel=\"noopener\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1810\" height=\"768\" src=\"https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/cta-comprendre-ia-entreprise-fr-1.png\" alt=\"Formation Comprendre l'intelligence artificielle en entreprise\" class=\"wp-image-254367\" srcset=\"https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/cta-comprendre-ia-entreprise-fr-1.png 1810w, https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/cta-comprendre-ia-entreprise-fr-1-300x127.png 300w, https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/cta-comprendre-ia-entreprise-fr-1-1024x434.png 1024w, https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/cta-comprendre-ia-entreprise-fr-1-768x326.png 768w, https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/cta-comprendre-ia-entreprise-fr-1-1536x652.png 1536w, https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/cta-comprendre-ia-entreprise-fr-1-600x255.png 600w\" sizes=\"(max-width: 1810px) 100vw, 1810px\" \/><\/a><\/figure>\n<h2 id=\"protocole\">Le protocole anti-deepfake \u00e0 instaurer d\u00e8s demain<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/protocole-verification-paiements-1.webp\" alt=\"\u00e9quipe finance appliquant un protocole de v\u00e9rification des paiements\" width=\"1584\" height=\"672\" loading=\"lazy\" \/><\/p>\n<p>En juillet 2024, un cadre de Ferrari re\u00e7oit des messages WhatsApp au nom du directeur g\u00e9n\u00e9ral Benedetto Vigna. Un appel suit, avec la voix du patron, accent du sud de l&#8217;Italie compris. Cette voix g\u00e9n\u00e9r\u00e9e par IA \u00e9voque une acquisition confidentielle et presse le cadre de signer. Ce dernier flaire pourtant l&#8217;anomalie. Il pose alors une question dont seul le vrai dirigeant conna\u00eet la r\u00e9ponse : le titre du livre recommand\u00e9 quelques jours plus t\u00f4t. L&#8217;escroc raccroche aussit\u00f4t, comme le raconte la <a href=\"https:\/\/sloanreview.mit.edu\/article\/how-ferrari-hit-the-brakes-on-a-deepfake-ceo\/\" target=\"_blank\" rel=\"noopener noreferrer\">MIT Sloan Management Review<\/a>. Une question a suffi l\u00e0 o\u00f9 des millions \u00e9taient en jeu.<\/p>\n<p>Ce r\u00e9flexe s&#8217;industrialise. Voici le protocole minimal \u00e0 d\u00e9ployer, applicable m\u00eame dans une PME de dix personnes :<\/p>\n<ul>\n<li><strong>Le rappel syst\u00e9matique.<\/strong> Toute demande de paiement re\u00e7ue par t\u00e9l\u00e9phone, visio ou messagerie se v\u00e9rifie par un rappel. Utilisez le num\u00e9ro officiel connu, jamais celui affich\u00e9 par l&#8217;appelant ;<\/li>\n<li><strong>La double validation.<\/strong> Aucun virement au-dessus d&#8217;un seuil d\u00e9fini ne part sans l&#8217;accord de deux personnes. Le niveau hi\u00e9rarchique du demandeur n&#8217;y change rien ;<\/li>\n<li><strong>La question de contr\u00f4le.<\/strong> \u00c0 la mani\u00e8re de Ferrari, convenez en \u00e9quipe de questions dont les r\u00e9ponses ne figurent nulle part en ligne ;<\/li>\n<li><strong>Le canal refuge.<\/strong> D\u00e9finissez \u00e0 l&#8217;avance le canal officiel o\u00f9 toute demande sensible doit \u00eatre confirm\u00e9e par \u00e9crit ;<\/li>\n<li><strong>Le droit au doute.<\/strong> Inscrivez noir sur blanc qu&#8217;aucun collaborateur ne sera sanctionn\u00e9 pour avoir retard\u00e9 une op\u00e9ration le temps d&#8217;une v\u00e9rification.<\/li>\n<\/ul>\n<p>Remarquez un point essentiel : aucune de ces mesures n&#8217;exige un outil de d\u00e9tection co\u00fbteux. La d\u00e9fense la plus efficace contre une technologie de pointe reste une proc\u00e9dure simple, connue de tous et appliqu\u00e9e sans exception.<\/p>\n<h3>Et si le doute persiste malgr\u00e9 tout ?<\/h3>\n<p>Il arrive qu&#8217;aucun signal ne soit flagrant et que la pression monte. Dans ce cas, appliquez la r\u00e8gle d&#8217;or : suspendre, v\u00e9rifier, documenter. Suspendez l&#8217;op\u00e9ration, m\u00eame si l&#8217;interlocuteur menace ou s&#8217;impatiente. V\u00e9rifiez ensuite par un second canal, en contactant la personne r\u00e9elle sur son num\u00e9ro habituel. Documentez enfin la demande : capture d&#8217;\u00e9cran, num\u00e9ro appelant, horaire. En cas de tentative av\u00e9r\u00e9e, signalez l&#8217;incident \u00e0 l&#8217;OFCS et pr\u00e9venez votre banque. Une alerte pr\u00e9coce prot\u00e8ge aussi les autres entreprises de votre secteur.<\/p>\n<h2 id=\"former\">Former vos \u00e9quipes : le pare-feu humain<\/h2>\n<p>Un protocole n&#8217;a de valeur que si chacun comprend pourquoi il existe. Or, le sondage Deloitte cit\u00e9 plus haut r\u00e9v\u00e8le un d\u00e9ficit inqui\u00e9tant. Un dirigeant sur cinq n&#8217;a aucune confiance dans la capacit\u00e9 de son organisation \u00e0 r\u00e9pondre \u00e0 une attaque deepfake. Ce foss\u00e9 ne se comble pas avec une note interne. Il se comble par la sensibilisation, la d\u00e9monstration et la r\u00e9p\u00e9tition.<\/p>\n<p>Concr\u00e8tement, une demi-journ\u00e9e suffit pour changer la donne. Faites \u00e9couter de vraies voix clon\u00e9es \u00e0 vos \u00e9quipes. D\u00e9cortiquez ensemble les cas Arup et Ferrari, puis r\u00e9p\u00e9tez le protocole de v\u00e9rification sur des sc\u00e9narios r\u00e9alistes. Les collaborateurs qui ont entendu un clone une fois ne l&#8217;oublient plus. Cette mont\u00e9e en comp\u00e9tence rejoint d&#8217;ailleurs une obligation plus large. Comme nous l&#8217;expliquions dans notre article sur <a href=\"https:\/\/www.itta.net\/blog\/ai-act-entreprises-suisses\/\" target=\"_blank\" rel=\"noopener noreferrer\">l&#8217;AI Act et les entreprises suisses<\/a>, la formation des collaborateurs \u00e0 l&#8217;IA est d\u00e9j\u00e0 exig\u00e9e pour toute entreprise active sur le march\u00e9 europ\u00e9en. Faire d&#8217;une pierre deux coups, conformit\u00e9 et s\u00e9curit\u00e9, rend l&#8217;investissement d&#8217;autant plus rentable. Pour aller plus loin, notre catalogue de <a href=\"https:\/\/www.itta.net\/formations\/intelligence-artificielle\/\" target=\"_blank\" rel=\"noopener noreferrer\">formations en intelligence artificielle<\/a> couvre la sensibilisation comme la gouvernance.<\/p>\n\n<figure class=\"wp-block-image size-large itta-cta-banner\" style=\"margin:2.75rem 0\"><a href=\"https:\/\/www.itta.net\/formations\/intelligence-artificielle\/gouvernance-et-ia-responsable\/gouverner-usage-de-ia-en-entreprise\/\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" width=\"1810\" height=\"768\" src=\"https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/cta-gouverner-usage-ia-deepfake-fr-1.png\" alt=\"Formation Gouverner l'usage de l'IA en entreprise\" class=\"wp-image-254369\" srcset=\"https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/cta-gouverner-usage-ia-deepfake-fr-1.png 1810w, https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/cta-gouverner-usage-ia-deepfake-fr-1-300x127.png 300w, https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/cta-gouverner-usage-ia-deepfake-fr-1-1024x434.png 1024w, https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/cta-gouverner-usage-ia-deepfake-fr-1-768x326.png 768w, https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/cta-gouverner-usage-ia-deepfake-fr-1-1536x652.png 1536w, https:\/\/www.itta.net\/wp-content\/uploads\/2026\/08\/cta-gouverner-usage-ia-deepfake-fr-1-600x255.png 600w\" sizes=\"(max-width: 1810px) 100vw, 1810px\" \/><\/a><\/figure>\n<h2 id=\"conclusion\">Conclusion<\/h2>\n<p>Le deepfake a chang\u00e9 de camp. Il n&#8217;amuse plus les r\u00e9seaux sociaux : il pille les comptes des entreprises. Arup a perdu 25 millions de dollars face \u00e0 une visioconf\u00e9rence truqu\u00e9e. En Suisse, la fraude au CEO a progress\u00e9 d&#8217;un tiers en un an. Pourtant, la parade tient en trois couches compl\u00e9mentaires. Des yeux entra\u00een\u00e9s rep\u00e8rent les artefacts. Un protocole de v\u00e9rification ferme les portes, sans exception ni passe-droit. Des \u00e9quipes form\u00e9es osent douter, m\u00eame face \u00e0 la voix du patron. Ferrari l&#8217;a d\u00e9montr\u00e9 : une seule bonne question vaut mieux que le meilleur d\u00e9tecteur du march\u00e9. La question n&#8217;est donc pas de savoir si votre entreprise sera vis\u00e9e un jour. Elle est de savoir si la personne qui d\u00e9crochera saura quoi faire. \u00c0 vous de faire en sorte que la r\u00e9ponse soit oui.<\/p>\n<h2 id=\"faq-deepfake\">FAQ : reconna\u00eetre un deepfake en entreprise<\/h2>\n<p><strong>Qu&#8217;est-ce qu&#8217;un deepfake exactement ?<\/strong><\/p>\n<p>Un deepfake est un contenu audio, photo ou vid\u00e9o g\u00e9n\u00e9r\u00e9 par IA qui imite une personne r\u00e9elle de fa\u00e7on cr\u00e9dible. Quelques minutes d&#8217;enregistrements publics suffisent aujourd&#8217;hui \u00e0 cloner une voix ou un visage.<\/p>\n<p><strong>Comment reconna\u00eetre un deepfake en visioconf\u00e9rence ?<\/strong><\/p>\n<p>Surveillez la synchronisation labiale, les contours du visage en mouvement et les clignements d&#8217;yeux. Demandez un geste impr\u00e9vu, comme tourner la t\u00eate de profil : les syst\u00e8mes en temps r\u00e9el d\u00e9crochent souvent.<\/p>\n<p><strong>Les PME suisses sont-elles vraiment concern\u00e9es ?<\/strong><\/p>\n<p>Oui. L&#8217;OFCS a enregistr\u00e9 970 signalements de fraude au CEO en 2025, en forte hausse. Les PME sont vis\u00e9es en priorit\u00e9, car leurs validations de paiement reposent souvent sur la confiance plut\u00f4t que sur des proc\u00e9dures \u00e9crites.<\/p>\n<p><strong>Existe-t-il des outils de d\u00e9tection automatique des deepfakes ?<\/strong><\/p>\n<p>Des solutions existent, mais aucune n&#8217;est infaillible face aux g\u00e9n\u00e9rateurs r\u00e9cents. La d\u00e9fense la plus fiable reste proc\u00e9durale : rappel sur canal officiel, double validation des paiements et questions de contr\u00f4le convenues en interne.<\/p>\n<p><strong>Que faire si mon entreprise a \u00e9t\u00e9 victime d&#8217;un deepfake ?<\/strong><\/p>\n<p>Bloquez imm\u00e9diatement les virements aupr\u00e8s de votre banque et conservez toutes les preuves. D\u00e9posez plainte \u00e0 la police, puis annoncez l&#8217;incident \u00e0 l&#8217;OFCS. Informez enfin vos \u00e9quipes pour \u00e9viter une seconde vague.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Une visioconf\u00e9rence truqu\u00e9e a suffi pour d\u00e9rober 25 millions de dollars au groupe Arup. Les deepfakes ne rel\u00e8vent plus de la science-fiction : ils visent d\u00e9sormais la tr\u00e9sorerie des entreprises, y compris en Suisse. Voici comment reconna\u00eetre un deepfake et le protocole qui prot\u00e8ge vos \u00e9quipes. Sommaire Du gadget au braquage num\u00e9rique : ce qui [&hellip;]<\/p>\n","protected":false},"author":112,"featured_media":254365,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[2996],"tags":[],"class_list":["post-254377","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-artificial-intelligence"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How to Spot a Deepfake: a Practical Guide for Business<\/title>\n<meta name=\"description\" content=\"Fake video calls and cloned voices already cost companies millions. Learn the warning signs and the protocol that stops deepfake fraud.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.itta.net\/en\/blog\/how-to-spot-a-deepfake\/\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Damien Crocq\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"11 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":[\"Article\",\"BlogPosting\"],\"@id\":\"https:\\\/\\\/www.itta.net\\\/en\\\/blog\\\/how-to-spot-a-deepfake\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.itta.net\\\/en\\\/blog\\\/how-to-spot-a-deepfake\\\/\"},\"author\":{\"name\":\"Damien Crocq\",\"@id\":\"https:\\\/\\\/www.itta.net\\\/en\\\/#\\\/schema\\\/person\\\/ca875e6c61a8f6f224901d4b48e1494f\"},\"headline\":\"How to Spot a Deepfake Before It Costs Your Company Millions\",\"datePublished\":\"2026-08-18T15:59:00+00:00\",\"dateModified\":\"2026-08-18T15:59:05+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.itta.net\\\/en\\\/blog\\\/how-to-spot-a-deepfake\\\/\"},\"wordCount\":2250,\"publisher\":{\"@id\":\"https:\\\/\\\/www.itta.net\\\/en\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.itta.net\\\/en\\\/blog\\\/how-to-spot-a-deepfake\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.itta.net\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/reconnaitre-deepfake-miniature-1.webp\",\"articleSection\":[\"Artificial Intelligence\"],\"inLanguage\":\"en-GB\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.itta.net\\\/en\\\/blog\\\/how-to-spot-a-deepfake\\\/\",\"url\":\"https:\\\/\\\/www.itta.net\\\/en\\\/blog\\\/how-to-spot-a-deepfake\\\/\",\"name\":\"How to Spot a Deepfake: a Practical Guide for Business\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.itta.net\\\/en\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.itta.net\\\/en\\\/blog\\\/how-to-spot-a-deepfake\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.itta.net\\\/en\\\/blog\\\/how-to-spot-a-deepfake\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.itta.net\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/reconnaitre-deepfake-miniature-1.webp\",\"datePublished\":\"2026-08-18T15:59:00+00:00\",\"dateModified\":\"2026-08-18T15:59:05+00:00\",\"description\":\"Fake video calls and cloned voices already cost companies millions. 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