{"id":1884,"date":"2026-06-17T09:21:31","date_gmt":"2026-06-17T07:21:31","guid":{"rendered":"https:\/\/distri-x.nl\/niet-gecategoriseerd\/dark-fibre-runs-through-car-parks-why-layer-1-encryption-is-not-a-luxury\/"},"modified":"2026-10-08T13:18:08","modified_gmt":"2026-10-08T11:18:08","slug":"dark-fibre-runs-through-car-parks-why-layer-1-encryption-is-not-a-luxury","status":"publish","type":"post","link":"https:\/\/distri-x.nl\/en\/optic-transport\/dark-fibre-runs-through-car-parks-why-layer-1-encryption-is-not-a-luxury\/","title":{"rendered":"Dark fibre runs through car parks: why Layer 1 encryption is not a luxury"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1884\" class=\"elementor elementor-1884 elementor-993\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d31f1bd e-flex e-con-boxed e-con e-parent\" data-id=\"d31f1bd\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9c20d26 elementor-widget elementor-widget-heading\" data-id=\"9c20d26\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How does fibre tapping work?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9bea4a9 elementor-widget elementor-widget-text-editor\" data-id=\"9bea4a9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>A fibre-optic cable transmits data in the form of light pulses. You don\u2019t need to cut the cable to intercept that data. By bending the fibre slightly, photons escape from the core. A photodetector positioned at that bend captures that light and can reconstruct the signal.   <\/p><p>The attack is passive. No electrical connection is required, there is no signal interference, and in most cases no alarms are triggered within the network. Data communication continues as normal whilst the data is being read.  <\/p><p>The physical access required for this is limited. A cable duct in a multi-storey car park, a plant room in an office building or a street cabinet in a public space are, in practice, more accessible than organisations realise. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0b12820 elementor-widget elementor-widget-heading\" data-id=\"0b12820\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Where does dark fibre run through?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bfc94b5 elementor-widget elementor-widget-text-editor\" data-id=\"bfc94b5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Dark fibre is laid alongside existing infrastructure. In practice, this means: cable ducts beneath public roads, in shared service rooms within buildings, through multi-storey car parks beneath city centres, and alongside other existing utility lines in tunnels and railway tunnels. <\/p><p>Those routes were determined by what was feasible during construction, not by security considerations. Along a ten-kilometre stretch between two data centres, there are dozens of points where the cable is physically accessible to anyone with the right tools and a bit of time. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-406cd8e elementor-widget elementor-widget-heading\" data-id=\"406cd8e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What is Layer 1 encryption?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3884998 elementor-widget elementor-widget-text-editor\" data-id=\"3884998\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Network communication is protected at various layers of the OSI model. TLS encrypts at the application layer. MACsec operates at Layer 2. IPsec operates at Layer 3. All these methods encrypt the data packet, but the optical signal itself, the light pulses in the fibre, remains unencrypted.    <\/p><p>Layer 1 encryption, also known as Optical Layer Encryption (OLE) or Physical Layer Encryption (PLE), encrypts the light signal before it leaves the equipment. The encryption takes place within the transport device itself, at the optical frame level. Whatever travels over the dark fibre is encrypted light from start to finish.  <\/p><p>An attacker who taps into the fibre captures encrypted light. Without the key, the signal cannot be reconstructed. <\/p><p><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b7d0517 elementor-widget elementor-widget-heading\" data-id=\"b7d0517\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What is the difference compared with encryption at higher layers?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-04dc831 elementor-widget elementor-widget-text-editor\" data-id=\"04dc831\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Higher layers protect the data, but not the transport layer itself. Metadata relating to the communication, such as the fact that communication is taking place, the volume of the data streams and the timing pattern, is still visible to anyone who intercepts the signal. <\/p><p>L1 encryption completely obscures the transport layer. There is no discernible structure in the intercepted signal. This also makes it resistant to attacks that seek to decrypt historically intercepted data at a later date, using future computing power, a technique also known as \u2018harvest now, decrypt later\u2019.  <\/p><p><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0f03908 elementor-widget elementor-widget-heading\" data-id=\"0f03908\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Latency and performance\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bea8a85 elementor-widget elementor-widget-text-editor\" data-id=\"bea8a85\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>A common objection to L1 encryption is its impact on latency. In practice, modern L1 encryption devices add less than one microsecond of latency. For most applications, this is negligible. Encryption and decryption take place in dedicated hardware at line speed, without limiting throughput.   <\/p><p><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f64167b elementor-widget elementor-widget-heading\" data-id=\"f64167b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">When is L1 encryption relevant?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2dac275 elementor-widget elementor-widget-text-editor\" data-id=\"2dac275\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>L1 encryption is relevant for any connection over dark fibre where the confidentiality of the data must not depend solely on the security of higher layers. This applies to connections between data centres, campus connections over leased dark fibre, and interconnections between the sites of organisations that handle sensitive data.  <\/p><p>Regulations such as NIS2 and sector-specific standards for financial institutions and healthcare organisations are placing increasing demands on encryption in transit. L1 encryption can form part of a demonstrably secure transport layer. <\/p><p>PacketLight Networks and Smartoptics are examples of vendors that integrate Layer 1 encryption into their optical transport hardware.<\/p><p><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7664596 elementor-widget elementor-widget-button\" data-id=\"7664596\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/distri-x.nl\/en\/contactus\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Interested in finding out how L1 encryption fits into your dark fibre infrastructure? We\u2019d be happy to help you find a solution. <\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Organisations that lease or own dark fibre often regard that<br \/>\nconnection as private infrastructure. Their own fibre, their own data,<br \/>\ntheir own management. What is often underestimated, however, is that the physical cable runs<br \/>\nthrough infrastructure that you do not manage, beneath streets, through<br \/>\nbuilding service rooms, via multi-storey car parks and<br \/>\ncable ducts in the public domain. And anyone with physical access to<br \/>\nthe fibre has access to the data travelling over it.    <\/p>\n","protected":false},"author":2,"featured_media":1883,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24,28],"tags":[],"class_list":["post-1884","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-optic-transport","category-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Tapping dark fibre: why L1 encryption is essential | Distri X<\/title>\n<meta name=\"description\" content=\"Dark fibre runs through public infrastructure. Physical access is all that is needed to intercept data. 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Physical access is all that is needed to intercept data. 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