--- title: Cyprus and Greece Establish Quantum-Secure Satellite Link description: Cyprus and Greece established their first quantum-secure satellite data connection, using Sparkle's Quantum Safe Interconnect (QSI) system layered onto Hellas... canonical: https://daily.dev/posts/cyprus-and-greece-establish-quantum-secure-satellite-link-wzihgoxil twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Cyprus and Greece Establish Quantum-Secure Satellite Link | daily.dev og:description: Cyprus and Greece established their first quantum-secure satellite data connection, using Sparkle's Quantum Safe Interconnect (QSI) system layered onto Hellas... og:url: https://daily.dev/posts/cyprus-and-greece-establish-quantum-secure-satellite-link-wzihgoxil og:image: https://api.daily.dev/og/posts/wziHGoxiL.png og:image:alt: Cyprus and Greece Establish Quantum-Secure Satellite Link og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Cyprus and Greece Establish Quantum-Secure Satellite Link **[The Quantum Insider](https://daily.dev/sources/thequantuminsider)** · 4 min read · 0 upvotes · 0 comments ## Summary Cyprus and Greece established their first quantum-secure satellite data connection, using Sparkle's Quantum Safe Interconnect (QSI) system layered onto Hellas Sat's satellite infrastructure. The link connects Sparkle's Athens data centre with Hellas Sat facilities in Cyprus, with data traveling roughly 72,000 kilometres round-trip through the satellite. The trial aims to protect against harvest-now-decrypt-later (HNDL) attacks, where adversaries intercept and store encrypted data today hoping to decrypt it once quantum computers mature. Because QSI is software-based, it can be layered onto existing terrestrial and satellite networks without replacing infrastructure, and the companies say this opens commercial prospects for quantum-secure satellite services in remote and critical locations. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What is harvest-now-decrypt-later (HNDL) and why does it matter for satellite communications? Harvest-now-decrypt-later is a threat model where adversaries intercept and store encrypted data today, betting that future quantum computers will be able to break the encryption later. Satellite links are especially exposed because signals travel long distances and can be intercepted en route, which is why operators are testing quantum-safe protections like Sparkle's QSI system on satellite connections. _Teams securing long-distance links against future decryption track HNDL mitigation approaches like this on daily.dev._ ### How does Sparkle's Quantum Safe Interconnect (QSI) system protect data without replacing existing network infrastructure? Sparkle's QSI system is software-based and works by transmitting data securely while automatically rotating encryption keys, which lets it be layered onto existing terrestrial and satellite networks without ripping out current systems. This allows companies to upgrade protection site by site, and it has been demonstrated on both a fibre link between Greek data centres and a live satellite connection to Cyprus covering roughly 72,000 kilometres. _Engineers evaluating incremental quantum-safe rollouts follow real-world deployments like this on daily.dev._ ## Similar posts on daily.dev - [Arqit, Es’hailSat and AIEE Demonstrate Quantum-Safe Satellite Communications](https://daily.dev/posts/arqit-es-hailsat-and-aiee-demonstrate-quantum-safe-satellite-communications-mekf2ncc1) · The Quantum Insider · 0 upvotes · 0 comments - [Quantum Corridor, Ciena and Toshiba Test 1.6 Tb/s Quantum-Safe Network Encryption](https://daily.dev/posts/quantum-corridor-ciena-and-toshiba-test-1-6-tb-s-quantum-safe-network-encryption-cvuegn7c3) · The Quantum Insider · 0 upvotes · 0 comments - [Scientists reveal it is feasible to send quantum signals from Earth to a satellite](https://daily.dev/posts/scientists-reveal-it-is-feasible-to-send-quantum-signals-from-earth-to-a-satellite-fxr2forkl) · Phys.org · 0 upvotes · 0 comments - [CSIRO Builds Quantum Light Sources to Counter GPS Jamming and Spoofing](https://daily.dev/posts/csiro-builds-quantum-light-sources-to-counter-gps-jamming-and-spoofing-jkqzxiajr) · The Quantum Insider · 0 upvotes · 0 comments - [SES and Airbus to Build Optical Ground Station for EAGLE-1 Quantum Satellite](https://daily.dev/posts/ses-and-airbus-to-build-optical-ground-station-for-eagle-1-quantum-satellite-9ytpyyxke) · The Quantum Insider · 0 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security), [#quantum-computing](https://daily.dev/tags/quantum-computing) [View this post on daily.dev](https://daily.dev/posts/cyprus-and-greece-establish-quantum-secure-satellite-link-wzihgoxil) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Cyprus and Greece Establish Quantum-Secure Satellite Link","url":"https://daily.dev/posts/cyprus-and-greece-establish-quantum-secure-satellite-link-wzihgoxil","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/cyprus-and-greece-establish-quantum-secure-satellite-link-wzihgoxil"},"datePublished":"2026-09-02T13:47:21.750Z","dateModified":"2026-09-02T13:51:44.746Z","description":"Cyprus and Greece established their first quantum-secure satellite data connection, using Sparkle's Quantum Safe Interconnect (QSI) system layered onto Hellas...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/910db75ab7600300024516d9e074fcf5?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/910db75ab7600300024516d9e074fcf5?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"The Quantum Insider","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"The Quantum Insider","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/7b14a6b34c1b464c9e8a88d9a0dac951","url":"https://daily.dev/sources/thequantuminsider"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/cyprus-and-greece-establish-quantum-secure-satellite-link-wzihgoxil","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"security,quantum-computing","timeRequired":"PT4M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"The Quantum Insider","item":"https://daily.dev/sources/thequantuminsider"},{"@type":"ListItem","position":3,"name":"Cyprus and Greece Establish Quantum-Secure Satellite Link"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/cyprus-and-greece-establish-quantum-secure-satellite-link-wzihgoxil#faq","mainEntity":[{"@type":"Question","name":"What is harvest-now-decrypt-later (HNDL) and why does it matter for satellite communications?","acceptedAnswer":{"@type":"Answer","text":"Harvest-now-decrypt-later is a threat model where adversaries intercept and store encrypted data today, betting that future quantum computers will be able to break the encryption later. Satellite links are especially exposed because signals travel long distances and can be intercepted en route, which is why operators are testing quantum-safe protections like Sparkle's QSI system on satellite connections. Teams securing long-distance links against future decryption track HNDL mitigation approaches like this on daily.dev."}},{"@type":"Question","name":"How does Sparkle's Quantum Safe Interconnect (QSI) system protect data without replacing existing network infrastructure?","acceptedAnswer":{"@type":"Answer","text":"Sparkle's QSI system is software-based and works by transmitting data securely while automatically rotating encryption keys, which lets it be layered onto existing terrestrial and satellite networks without ripping out current systems. This allows companies to upgrade protection site by site, and it has been demonstrated on both a fibre link between Greek data centres and a live satellite connection to Cyprus covering roughly 72,000 kilometres. Engineers evaluating incremental quantum-safe rollouts follow real-world deployments like this on daily.dev."}}]} ```