{"id":1522,"date":"2025-10-07T16:22:29","date_gmt":"2025-10-07T14:22:29","guid":{"rendered":"https:\/\/www.5thfloor.be\/?p=1522"},"modified":"2026-04-23T17:18:08","modified_gmt":"2026-04-23T15:18:08","slug":"cybersecurity-custom-application","status":"publish","type":"post","link":"https:\/\/www.5thfloor.be\/nl\/cybersecurity-custom-application\/","title":{"rendered":"Applications sur mesure : comment transformer un d\u00e9fi de s\u00e9curit\u00e9 en avantage strat\u00e9gique"},"content":{"rendered":"<p>Le secteur belge de la cybers\u00e9curit\u00e9 conna\u00eet une croissance remarquable. Selon <a href=\"https:\/\/www.agoria.be\/fr\/services\/expertise\/digitisation\/cybersecurity\/le-secteur-cyber-belge-va-doubler-en-5-ans-4000-experts-sont-recherches\">une r\u00e9cente analyse d&#8217;Agoria<\/a>, le chiffre d&#8217;affaires a bondi de 65% entre 2021 et 2024, passant de 1,58 \u00e0 2,61 milliards d&#8217;euros. Le secteur pr\u00e9voit m\u00eame un doublement d&#8217;ici 2030 avec une croissance annuelle de 15,9%.<\/p>\n\n\n\n<p>Ces investissements massifs t\u00e9moignent d&#8217;une prise de conscience collective. Pourtant, avec 275 cyberattaques par jour en moyenne en Belgique et une entreprise sur quatre touch\u00e9e en 2024, un angle mort persiste dans de nombreuses organisations : <strong>le patrimoine applicatif sur mesure d\u00e9velopp\u00e9 au fil des ann\u00e9es<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Comprendre le d\u00e9fi des applications sur mesure<\/h2>\n\n\n\n<p>Vos applications m\u00e9tier ont \u00e9t\u00e9 d\u00e9velopp\u00e9es avec soin, souvent pour r\u00e9pondre \u00e0 des besoins sp\u00e9cifiques que les solutions du march\u00e9 ne couvraient pas. C&#8217;est pr\u00e9cis\u00e9ment parce qu&#8217;elles sont critiques qu&#8217;elles m\u00e9ritent une attention particuli\u00e8re en mati\u00e8re de s\u00e9curit\u00e9.<\/p>\n\n\n\n<p>Prenons un exemple concret : une application de gestion d\u00e9velopp\u00e9e en 2015 pour le secteur public. \u00c0 l&#8217;\u00e9poque, elle r\u00e9pondait parfaitement aux besoins et aux standards de s\u00e9curit\u00e9. Aujourd&#8217;hui, les d\u00e9veloppeurs originaux ont \u00e9volu\u00e9, les frameworks utilis\u00e9s ne re\u00e7oivent plus de mises \u00e0 jour, et les pratiques de s\u00e9curit\u00e9 ont consid\u00e9rablement progress\u00e9. L&#8217;application fonctionne toujours, mais sa surface d&#8217;attaque s&#8217;est \u00e9largie sans que personne ne s&#8217;en aper\u00e7oive.<\/p>\n\n\n\n<p>Cette situation est loin d&#8217;\u00eatre rare. Elle refl\u00e8te une r\u00e9alit\u00e9 : <strong>le contexte de s\u00e9curit\u00e9 \u00e9volue plus vite que nos applications<\/strong>, et nous avons besoin d&#8217;une approche pour combler cet \u00e9cart sans tout reconstruire.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Un contexte qui amplifie l&#8217;urgence<\/h2>\n\n\n\n<p>Comme le souligne Eric Van Cangh, leader de Cyber Made in Belgium chez Agoria : <em>&#8220;Nous avons vu tr\u00e8s r\u00e9cemment l&#8217;impact d&#8217;une cyberattaque majeure dans notre a\u00e9roport national, o\u00f9 des criminels se sont empar\u00e9s des donn\u00e9es des passagers et ont pris une entreprise en otage.&#8221;<\/em><\/p>\n\n\n\n<p>Le d\u00e9fi est particuli\u00e8rement aigu pour les PME et le secteur public. Avec 4.000 postes d&#8217;experts en cybers\u00e9curit\u00e9 vacants et un taux d&#8217;inoccupation de 12,4% (contre 5,3% dans le reste de l&#8217;IT), recruter des sp\u00e9cialistes devient extr\u00eamement difficile. Parall\u00e8lement, 11% des services de cybers\u00e9curit\u00e9 sont fournis aux administrations publiques, qui g\u00e8rent des donn\u00e9es sensibles tout en naviguant entre contraintes budg\u00e9taires et ressources limit\u00e9es.<\/p>\n\n\n\n<p>La question devient alors : comment renforcer la s\u00e9curit\u00e9 de ce qu&#8217;on ma\u00eetrise partiellement, avec des ressources limit\u00e9es et sans tout r\u00e9\u00e9crire ?<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">L4F : une approche de modernisation progressive<\/h2>\n\n\n\n<p>C&#8217;est pour r\u00e9pondre \u00e0 ce d\u00e9fi que nous avons d\u00e9velopp\u00e9 <strong><a href=\"https:\/\/www.5thfloor.be\/nl\/oplossingen\/l4f\/\">Legacy for the Future (L4F)<\/a><\/strong> chez 5th floor. Plut\u00f4t qu&#8217;une r\u00e9\u00e9criture compl\u00e8te (co\u00fbteuse et risqu\u00e9e), nous proposons une transformation it\u00e9rative bas\u00e9e sur trois piliers compl\u00e9mentaires.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Auditer : \u00e9tablir une vision claire<\/h3>\n\n\n\n<p>La premi\u00e8re \u00e9tape consiste \u00e0 comprendre pr\u00e9cis\u00e9ment o\u00f9 nous en sommes. Ensemble, nous analysons votre parc applicatif pour identifier non seulement les vuln\u00e9rabilit\u00e9s techniques, mais aussi leur impact r\u00e9el sur votre m\u00e9tier.<\/p>\n\n\n\n<p>Concreet onderzoeken we:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Les d\u00e9pendances externes et leur niveau de maintenance<\/li>\n\n\n\n<li>Les pratiques de s\u00e9curit\u00e9 actuelles vs. les standards contemporains<\/li>\n\n\n\n<li>Les points d&#8217;exposition aux donn\u00e9es sensibles<\/li>\n\n\n\n<li>Le niveau de documentation et de connaissance disponible<\/li>\n<\/ul>\n\n\n\n<p>L&#8217;objectif ? Vous donner une carte pr\u00e9cise pour prioriser vos actions en fonction du risque m\u00e9tier, pas uniquement technique.<\/p>\n\n\n\n<div class=\"wp-block-uagb-image uagb-block-5a1c8927 wp-block-uagb-image--layout-default wp-block-uagb-image--effect-static wp-block-uagb-image--align-none\"><figure class=\"wp-block-uagb-image__figure\"><noscript><img decoding=\"async\" srcset=\"https:\/\/www.5thfloor.be\/wp-content\/uploads\/2025\/10\/screenshot-of-one-view-of-the-L4F-dashboard-1024x612.png ,https:\/\/www.5thfloor.be\/wp-content\/uploads\/2025\/10\/screenshot-of-one-view-of-the-L4F-dashboard.png 780w, https:\/\/www.5thfloor.be\/wp-content\/uploads\/2025\/10\/screenshot-of-one-view-of-the-L4F-dashboard.png 360w\" sizes=\"auto, (max-width: 480px) 150px\" src=\"https:\/\/www.5thfloor.be\/wp-content\/uploads\/2025\/10\/screenshot-of-one-view-of-the-L4F-dashboard-1024x612.png\" alt class=\"uag-image-1523\" width=\"558\" height=\"326\" title=\"screenshot of one view of the L4F dashboard\" loading=\"lazy\" role=\"img\"><\/noscript><img decoding=\"async\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20558%20326%22%3E%3C%2Fsvg%3E 558w\" sizes=\"auto, (max-width: 480px) 150px\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20558%20326%22%3E%3C%2Fsvg%3E\" alt class=\"uag-image-1523 lazyload\" width=\"558\" height=\"326\" title=\"screenshot of one view of the L4F dashboard\" loading=\"lazy\" role=\"img\" data-srcset=\"https:\/\/www.5thfloor.be\/wp-content\/uploads\/2025\/10\/screenshot-of-one-view-of-the-L4F-dashboard-1024x612.png ,https:\/\/www.5thfloor.be\/wp-content\/uploads\/2025\/10\/screenshot-of-one-view-of-the-L4F-dashboard.png 780w, https:\/\/www.5thfloor.be\/wp-content\/uploads\/2025\/10\/screenshot-of-one-view-of-the-L4F-dashboard.png 360w\" data-src=\"https:\/\/www.5thfloor.be\/wp-content\/uploads\/2025\/10\/screenshot-of-one-view-of-the-L4F-dashboard-1024x612.png\"><\/figure><\/div>\n\n\n\n<p><em>Exemple d\u2019une vue du dashboard <a href=\"https:\/\/www.5thfloor.be\/nl\/oplossingen\/l4f\/\">L4F<\/a> dont les axes sont la dette technique et la criticit\u00e9 li\u00e9e \u00e0 chaque app<\/em><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Prioriser : agir sur ce qui compte vraiment<\/h3>\n\n\n\n<p>Toutes les vuln\u00e9rabilit\u00e9s n&#8217;ont pas le m\u00eame impact. Une faille sur une application interne de gestion des cong\u00e9s ne repr\u00e9sente pas le m\u00eame risque qu&#8217;une exposition de donn\u00e9es clients ou utilisateurs. C&#8217;est pourquoi nous co-construisons avec vous un plan d&#8217;action qui priorise les interventions selon votre value stream et vos enjeux m\u00e9tier.<\/p>\n\n\n\n<p>Cette approche it\u00e9rative permet d&#8217;obtenir des r\u00e9sultats rapides l\u00e0 o\u00f9 c&#8217;est le plus critique, tout en \u00e9talant l&#8217;effort dans le temps. Les premi\u00e8res am\u00e9liorations de s\u00e9curit\u00e9 deviennent visibles d\u00e8s les premi\u00e8res semaines, sans paralyser vos op\u00e9rations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ma\u00eetriser : construire l&#8217;autonomie durable<\/h3>\n\n\n\n<p>La s\u00e9curit\u00e9 est un processus continu, pas un projet ponctuel. D\u00e8s lors, la mont\u00e9e en comp\u00e9tences de vos \u00e9quipes est au c\u0153ur de notre approche. Nous travaillons main dans la main avec vos collaborateurs : formation pratique, co-d\u00e9veloppement, transfert de connaissances, documentation.<\/p>\n\n\n\n<p>Comme le rappelle Saskia Van Uffelen, Manager Future Workforce chez Agoria : <em>&#8220;Les quelques centaines de dipl\u00f4m\u00e9s par an ne suffisent pas \u00e0 combler l&#8217;\u00e9cart. Nous avons besoin de toute urgence d&#8217;une plus grande coop\u00e9ration avec les coll\u00e8ges, les universit\u00e9s et les autres \u00e9tablissements d&#8217;enseignement.&#8221;<\/em><\/p>\n\n\n\n<p>Dans un march\u00e9 o\u00f9 4.000 experts manquent \u00e0 l&#8217;appel, d\u00e9velopper les comp\u00e9tences en interne devient une strat\u00e9gie de r\u00e9silience indispensable.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les r\u00e9sultats observ\u00e9s<\/h2>\n\n\n\n<p>Notre m\u00e9thodologie L4F permet d&#8217;obtenir des r\u00e9sultats tangibles sur plusieurs projets :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>R\u00e9duction des co\u00fbts de maintenance jusqu&#8217;\u00e0 50%<\/strong> : moins d&#8217;incidents, moins d&#8217;interventions d&#8217;urgence, plus de pr\u00e9visibilit\u00e9<\/li>\n\n\n\n<li><strong>Am\u00e9lioration de la stabilit\u00e9 et de la s\u00e9curit\u00e9<\/strong> : vuln\u00e9rabilit\u00e9s critiques trait\u00e9es en priorit\u00e9, r\u00e9duction mesurable de la surface d&#8217;attaque<\/li>\n\n\n\n<li><strong>Autonomie renforc\u00e9e des \u00e9quipes<\/strong> : connaissance partag\u00e9e, capacit\u00e9 \u00e0 maintenir et faire \u00e9voluer les applications<\/li>\n\n\n\n<li><strong>Budget lib\u00e9r\u00e9 pour l&#8217;innovation<\/strong> : r\u00e9duction de la dette technique permettant d&#8217;investir dans de nouvelles fonctionnalit\u00e9s<\/li>\n<\/ul>\n\n\n\n<p>Ces b\u00e9n\u00e9fices ne se substituent pas \u00e0 votre strat\u00e9gie de cybers\u00e9curit\u00e9 globale, mais la compl\u00e8tent en traitant un angle souvent n\u00e9glig\u00e9.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Construire ensemble une posture de s\u00e9curit\u00e9 renforc\u00e9e<\/h2>\n\n\n\n<p>Avec un secteur qui cro\u00eet de 15,9% par an et des cyberattaques qui ont augment\u00e9 de 165% en 2025, la cybers\u00e9curit\u00e9 est devenue un enjeu de continuit\u00e9 d&#8217;activit\u00e9. La bonne nouvelle ? Vos applications existantes peuvent devenir des atouts si on leur accorde l&#8217;attention qu&#8217;elles m\u00e9ritent.<\/p>\n\n\n\n<p>L4F vous propose une transformation progressive et r\u00e9aliste : identifier les risques r\u00e9els, prioriser les actions \u00e0 fort impact, et construire l&#8217;autonomie de vos \u00e9quipes. Dans un contexte de p\u00e9nurie d&#8217;expertise, cette approche permet d&#8217;avancer concr\u00e8tement sans d\u00e9pendre uniquement du march\u00e9 externe.<\/p>\n\n\n\n<div class=\"wp-block-uagb-call-to-action uagb-block-a94c6c7c wp-block-button\"><div class=\"uagb-cta__wrap\"><h3 class=\"uagb-cta__title\"><strong>Pr\u00eat \u00e0 renforcer la s\u00e9curit\u00e9 de votre patrimoine applicatif ?<\/strong><\/h3><p class=\"uagb-cta__desc\">Discutons ensemble de votre contexte et des opportunit\u00e9s de transformation pour vos applications m\u00e9tier. Notre \u00e9quipe peut vous accompagner dans une premi\u00e8re analyse de risques pour identifier vos priorit\u00e9s.<\/p><\/div><div class=\"uagb-cta__buttons\"><a href=\"#\" class=\"uagb-cta__button-link-wrapper wp-block-button__link\" target=\"_self\" rel=\"noopener noreferrer\">Echangeons sur votre situation<svg viewbox=\"0 0 512 512\"><path d=\"M504.3 273.6l-112.1 104c-6.992 6.484-17.18 8.218-25.94 4.406c-8.758-3.812-14.42-12.45-14.42-21.1L351.9 288H32C14.33 288 .0002 273.7 .0002 255.1S14.33 224 32 224h319.9l0-72c0-9.547 5.66-18.19 14.42-22c8.754-3.809 18.95-2.075 25.94 4.41l112.1 104C514.6 247.9 514.6 264.1 504.3 273.6z\" \/><\/svg><\/a><\/div><\/div>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Le secteur belge de la cybers\u00e9curit\u00e9 conna\u00eet une croissance remarquable. Selon une r\u00e9cente analyse d&#8217;Agoria, le chiffre d&#8217;affaires a bondi de 65% entre 2021 et 2024, passant de 1,58 \u00e0 2,61 milliards d&#8217;euros. Le secteur pr\u00e9voit m\u00eame un doublement d&#8217;ici 2030 avec une croissance annuelle de 15,9%. Ces investissements massifs t\u00e9moignent d&#8217;une prise de conscience [&hellip;]<\/p>","protected":false},"author":4,"featured_media":983,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"_uag_custom_page_level_css":"","_post_is_featured":"","_post_subtitle":"","_post_team_members":[],"_post_wp_authors":[],"_post_external_authors":[],"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1522","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Applications sur mesure : comment transformer un d\u00e9fi de s\u00e9curit\u00e9 en avantage strat\u00e9gique - 5th floor<\/title>\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.5thfloor.be\/nl\/cybersecurity-custom-application\/\" \/>\n<meta property=\"og:locale\" content=\"nl_NL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Applications sur mesure : comment transformer un d\u00e9fi de s\u00e9curit\u00e9 en avantage strat\u00e9gique - 5th floor\" \/>\n<meta property=\"og:description\" content=\"Le secteur belge de la cybers\u00e9curit\u00e9 conna\u00eet une croissance remarquable. Selon une r\u00e9cente analyse d&#8217;Agoria, le chiffre d&#8217;affaires a bondi de 65% entre 2021 et 2024, passant de 1,58 \u00e0 2,61 milliards d&#8217;euros. Le secteur pr\u00e9voit m\u00eame un doublement d&#8217;ici 2030 avec une croissance annuelle de 15,9%. 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