OpenSSH has implemented post-quantum key agreement algorithms to protect SSH connections against potential attacks from future quantum computers. Since version 9.0, it has defaulted to these algorithms and will issue warnings for non-post-quantum connections starting with version 10.1. Users are encouraged to update their servers to utilize these stronger cryptographic methods to prevent vulnerabilities associated with "store now, decrypt later" attacks.

The article discusses the importance of scanning for post-quantum cryptographic support as quantum computing technology advances. It emphasizes the need for organizations to assess their current cryptographic systems and prepare for potential vulnerabilities that quantum attacks may pose. Strategies for implementing post-quantum cryptography are also explored to enhance security in the future.