WISeKey's WISeSat Confirms Next Satellite Launch Scheduled for Mid-June from California to Advance Quantum-Safe Space Communications

WISeKey's WISeSat Confirms Next Satellite Launch Scheduled for Mid-June from California to Advance Quantum-Safe Space Communications

• By 2027, WISeSat.Space aims to establish a large constellation of satellites, incorporating WISeKey cryptographic keys and PQC semiconductor technology from SEALSQ, to ensure robust, quantum-resistant communication capabilities from space.
• The WISeSat satellite constellation aims to accelerate the deployment of its satellite constellation, scale QKD capabilities, and enable a scalable "Satellite-as-a-Service" business model that integrates decentralized IoT transactions and post-quantum secure communications

Geneva, Switzerland, June 3, 2025 –WISeKey International Holding Ltd ("WISeKey") ((SIX: WIHN, NASDAQ:WKEY), a leading global cybersecurity, blockchain, and IoT company, via its subsidiaries, WISeSat.Space SA ("WISeSat") and SEALSQ Corp (NASDAQ:LAES) ("SEALSQ" or "Company"), a company that focuses on developing and selling Semiconductors, PKI, and Post-Quantum technology hardware and software products, and today announced the upcoming launch of WISeSat 3.0, scheduled for second week of June 2025, marking the first satellite to embed SEALSQ's Quantum RootKey. This mission initiates a new era of quantum-safe space communications, establishing a space-based Proof-of-Concept for Post-Quantum Key Distribution (QKD) designed to secure global data infrastructure against emerging quantum threats.

This next-generation satellite platform will support cryptographic key generation and management both in orbit and at mission control. It ensures encryption, authentication, and validation of software and data using NIST-standardized post-quantum algorithms, including CRYSTALS-Kyber and CRYSTALS-Dilithium, selected in August 2024.

At the heart of WISeSat 3.0 lies the Quantum RootKey, a hardware-based root-of-trust module developed by SEALSQ to resist both classical and quantum cyberattacks. By isolating cryptographic operations within a tamper-resistant environment directly on the satellite, RootKey protects key storage, signing, and encryption processes. It enables end-to-end secure communications and digital identity services, even under the computing power of future quantum machines.

The satellite will deliver several key capabilities: secure command authentication to prevent unauthorized satellite control, encryption of sensitive data such as Earth observation, defense telemetry, and scientific research, and post-quantum key distribution for critical infrastructure sectors such as energy, transportation, and smart cities. It also allows for the secure onboarding of billions of IoT devices by providing quantum-resistant digital identities from space, even in remote or disconnected regions.

WISeSat has gradually embedded technologies from WISeKey, SEALSQ, and Hedera into its satellite operations, allowing these next-generation satellites to become a benchmark for post-quantum security from space. This advanced integration also supports the use of trusted digital tokens such as SEALCOIN, opening new frontiers in secure space-to-ground transactions and tokenized satellite-based services.

WISeSat.Space has also established key infrastructure, including a satellite antenna in La Línea, Spain, with plans to install another in Switzerland. These installations will enhance the monitoring and management of the growing satellite constellation, ensuring optimal performance and secure operations. By 2027, WISeSat.Space aims to establish a large constellation of satellites, incorporating WISeKey cryptographic keys and PQC semiconductor technology from SEALSQ, to ensure robust, quantum-resistant communication capabilities from space.

As quantum computing advances, the risk of key extraction, spoofing, and eavesdropping on satellite networks becomes increasingly urgent. SEALSQ's Post-Quantum RootKey architecture provides robust, real-time defenses, including secure key isolation, signature validation, and quantum-resilient encryption, ensuring any attempt to intercept or tamper with quantum key exchanges is immediately detectable.

In parallel, WISeSat's multi-layered quantum-secure platform is designed to leverage the unique properties of space, including microgravity, to enable scientific breakthroughs impossible on Earth. This includes quantum sensing for unspoofable positioning, navigation, and timing (PNT), secure deep-space exploration, and in-orbit manufacturing of quantum components in pristine, interference-free environments.

These advancements position WISeSat 3.0 to play a strategic role in enabling a sovereign, resilient, and secure digital infrastructure at a time of rising geopolitical and cybersecurity tensions. The mission underscores Europe and its allies' commitment to space sovereignty and secure digital transformation.

Together, WISeSat and SEALSQ are setting the foundation for a new generation of cyber-resilient, quantum-ready space systems, redefining global digital trust from orbit.

About WISeKey

WISeKey International Holding Ltd (("WISeKey", SIX: WIHN, NASDAQ:WKEY) is a global leader in cybersecurity, digital identity, and IoT solutions platform. It operates as a Swiss-based holding company through several operational subsidiaries, each dedicated to specific aspects of its technology portfolio. The subsidiaries include (i) SEALSQ Corp (NASDAQ:LAES), which focuses on semiconductors, PKI, and post-quantum technology products, (ii) WISeKey SA which specializes in RoT and PKI solutions for secure authentication and identification in IoT, Blockchain, and AI, (iii) WISeSat AG which focuses on space technology for secure satellite communication, specifically for IoT applications, (iv) WISe.ART Corp which focuses on trusted blockchain NFTs and operates the WISe.ART marketplace for secure NFT transactions, and (v) SEALCOIN AG which focuses on decentralized physical internet with DePIN technology and house the development of the SEALCOIN platform.



Each subsidiary contributes to WISeKey's mission of securing the internet while focusing on their respective areas of research and expertise. Their technologies seamlessly integrate into the comprehensive WISeKey platform. WISeKey secures digital identity ecosystems for individuals and objects using Blockchain, AI, and IoT technologies. With over 1.6 billion microchips deployed across various IoT sectors, WISeKey plays a vital role in securing the Internet of Everything. The company's semiconductors generate valuable Big Data that, when analyzed with AI, enable predictive equipment failure prevention. Trusted by the OISTE/WISeKey cryptographic Root of Trust, WISeKey provides secure authentication and identification for IoT, Blockchain, and AI applications. The WISeKey Root of Trust ensures the integrity of online transactions between objects and people. For more information on WISeKey's strategic direction and its subsidiary companies, please visit www.wisekey.com.

Disclaimer

This communication expressly or implicitly contains certain forward-looking statements concerning WISeKey International Holding Ltd and its business. Such statements involve certain known and unknown risks, uncertainties and other factors, which could cause the actual results, financial condition, performance or achievements of WISeKey International Holding Ltd to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. WISeKey International Holding Ltd is providing this communication as of this date and does not undertake to update any forward-looking statements contained herein as a result of new information, future events or otherwise.

This press release does not constitute an offer to sell, or a solicitation of an offer to buy, any securities, and it does not constitute an offering prospectus within the meaning of the Swiss Financial Services Act ("FinSA"), the FinSa's predecessor legislation or advertising within the meaning of the FinSA. Investors must rely on their own evaluation of WISeKey and its securities, including the merits and risks involved. Nothing contained herein is, or shall be relied on as, a promise or representation as to the future performance of WISeKey.



Press and Investor Contacts

WISeKey International Holding Ltd Company Contact: Carlos Moreira Chairman & CEO Tel: +41 22 594 3000 [email protected]

WISeKey Investor Relations (US)  The Equity Group Inc. Lena Cati Tel: +1 212 836-9611 [email protected]