SEALSQ Corp files patent on side-channel protection for post-quantum cryptography

SEALSQ Corp filed a new patent application for a protection technique aimed at side-channel attacks on polynomial-based post-quantum cryptographic algorithms. The company said the filing relates to its ongoing work on post-quantum hardware security as Google set a 2029 deadline for full post-quantum cryptography migration across its ecosystem.

SEALSQ linked Google’s 2029 timeline to systems it described as using post-quantum relevant cryptography, including Android 17 secure boot, Chromecast device authentication and TLS, and Widevine license requests currently based on RSA-2048. It also referenced cloud bootstrap processes in connection with that migration timeline.

The patent describes a message encoding stage solution for polynomial-based PQC algorithms. SEALSQ said the approach hardens hardware implementations against side-channel attacks that exploit power consumption, electromagnetic emissions, or timing variations.

SEALSQ said the invention represented a separate and complementary line of research developed in parallel with its QS7001 program, and that the filing coincided with the sampling phase of its QS7001 Quantum Shield secure element. The QS7001 was described as embedding NIST-approved PQC algorithms ML-KEM/Kyber and ML-DSA/Dilithium in silicon for secure boot, device authentication, TLS handshakes, and certificate management. Jean-Pierre Enguent, Chief Technology Officer of SEALSQ, said: “Google’s 2029 deadline is a strong wake-up call for the entire industry: software-only solutions will not suffice for long-term security. At the same time, even the best mathematical algorithms remain vulnerable if their physical implementation is not properly protected. This new patent addresses one of the most subtle and underappreciated challenges in post-quantum cryptography, protecting polynomial algorithms like Kyber against side-channel attacks at the message encoding stage. Developed in parallel with the QS7001, this invention demonstrates our dual focus on delivering strong products today while continuously building the intellectual property foundation for future generations of even more secure hardware.” Forward-looking statements in the communication addressed expectations about SEALSQ’s business strategy and future developments, and noted that actual results may differ from those expectations.