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OpenSSH Implements Post-Quantum Cryptography for Secure SSH Connections

throw0101d

9mo ago· 5 min readenNews

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Summary

OpenSSH has integrated post-quantum cryptography algorithms to safeguard SSH connections against quantum computer attacks. Starting with OpenSSH 9.0, the sntrup761x25519-sha512 algorithm was introduced, followed by mlkem768x25519-sha256 in OpenSSH 9.9, which became the default in OpenSSH 10.0. OpenSSH 10.1 will warn users to encourage migration to these stronger algorithms.

Key quotes

· 3 pulled

OpenSSH supports a number of cryptographic key agreement algorithms considered to be safe against attacks from quantum computers.

OpenSSH has offered post-quantum key agreement (KexAlgorithms) by default since release 9.0 (2022), initially via the sntrup761x25519-sha512 algorithm.

To encourage migration to these stronger algorithms, OpenSSH 10.1 will warn the user when a

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