Telecommunications operator Sparkle, together with satellite provider Hellas Sat, has completed the deployment of a secure communication link between Greece and Cyprus. This is the first connection of its kind on this geographic route that is resistant to attacks using quantum computing.
The route runs from Sparkle's data center in Athens to Hellas Sat's infrastructure in Cyprus, utilizing an existing satellite backbone. The total signal distance exceeds 72,000 kilometers, highlighting the complexity of ensuring security over such extensive lines.
Next-Generation Protection Technology
At the core of the solution is the Quantum Safe Interconnect (QSI) protocol. This architecture ensures not only quantum-resistant delivery of encryption keys but also their automatic rotation within IPsec sessions. The key goal is to neutralize the threat of so-called "harvest now, decrypt later" attacks, where malicious actors accumulate encrypted data today with the expectation of breaking it with quantum machines in the future.
Notably, this is not the partners' first experiment. As early as March of this year, the companies successfully tested QSI technology over terrestrial lines between two Greek data centers. The current launch is a logical continuation, confirming the protocol's operability under satellite transmission conditions with their inherent delays and packet losses.
The operators now intend to assess the commercial potential of the service. Primarily, this concerns corporate clients with distributed infrastructure, remote facilities, and high security requirements for critical data.
This step comes amid active standardization of post-quantum cryptography: in July, the International Organization for Standardization officially included the Classic McEliece algorithm in the relevant asymmetric encryption standard, setting a direction for the entire industry.
Analyst's comment: Satellite channels have historically been one of the most vulnerable links in telecommunications due to the difficulty of physical protection and the wide interception zone. The pilot project by Sparkle and Hellas Sat is an important precedent demonstrating that quantum resistance is ceasing to be a purely theoretical concept and is becoming a practical requirement for global connectivity. However, before mass adoption, issues of cost and compatibility with legacy equipment still need to be addressed.