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Crypto

Kyber ransomware first confirmed to use post-quantum cryptography in apparent psychological tactic

Kyber ransomware has been identified as the first confirmed case of using post-quantum cryptography, drawing attention across the security industry, analysts said. Rapid7 said its review of a Windows variant found it protected encryption keys with ML-KEM1024, while files were encrypted with AES-256. Experts said the move appears aimed at psychological pressure and marketing impact rather than operational need. Some variants also made overstated claims about using ML-KEM.

AI & Enterprise

Piolink says it aims to leap into cyber resilience technology company

Piolink on April 23 held the “Piolink Resilience Summit 2026” at The Westin Josun Seoul Parnas and underscored its identity as a technology company focused on strengthening cyber resilience. Chief executive Cho Young-cheol said resilience that sustains business during crises is central to corporate survival and growth. He said perfect defence is impossible and stressed maintaining services and rapid recovery after attacks.

Games & Commerce

18-year-old Excel bug still used in attacks, warning for legacy Office users

A Microsoft Excel security flaw first reported 18 years ago is still being exploited in real-world attacks, highlighting risks for organisations running unsupported software. The U.S. Cybersecurity and Infrastructure Security Agency added CVE-2009-0238 to its catalogue of known exploited vulnerabilities and told U.S. federal civilian agencies to complete mitigation by April 28. The bug affects older Excel and Office components, while newer Excel versions are not affected.