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GitHub is adding a post-quantum secure SSH key exchange algorithm to protect Git data access against future quantum computing threats.
•The new algorithm, sntrup761x25519-sha512, combines Streamlined NTRU Prime (post-quantum) with classical X25519 elliptic curve Diffie-Hellman for hybrid security
•This addresses the "store now, decrypt later" attack vector, where encrypted sessions captured today could be decrypted by future quantum computers
•Rollout begins September 17, 2025 for GitHub.com and non-US GitHub Enterprise Cloud regions; US region is excluded due to FIPS compliance requirements
•OpenSSH 9.0+ clients will automatically use the new algorithm; older clients fall back gracefully to classical algorithms without disruption
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HTTPS access and GitHub Enterprise Server (until 3.19) are unaffected; only SSH-based Git connections are impacted
This summary was automatically generated by AI based on the original article and may not be fully accurate.
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