--- title: "How Do You Defend Neo4j Against Quantum Computers?" url: https://daily.dev/posts/how-do-you-defend-neo4j-against-quantum-computers--z212t2etd source_url: https://medium.com/neo4j/how-do-you-defend-neo4j-against-quantum-computers-342f2134b2e6 type: article source: "neo4j" published: 2026-06-15T10:19:09.846Z updated: 2026-06-15T10:19:40.747Z tags: ["backend", "quantum-computing", "cryptography", "neo4j"] reading_time: 10 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # How Do You Defend Neo4j Against Quantum Computers? **[neo4j](https://daily.dev/sources/neo4j)** · 10 min read · 0 upvotes · 0 comments ## Summary Neo4j now supports post-quantum hybrid key exchange (X25519MLKEM768) for SSL/TLS encrypted Bolt connections, starting with the 2025.01 release. This addresses the 'Harvest Now, Decrypt Later' (HNDL) threat, where adversaries capture encrypted traffic today to decrypt it once quantum computers become capable. The hybrid approach combines classical X25519 elliptic curve Diffie-Hellman with the NIST-standardized ML-KEM-768 post-quantum algorithm, ensuring connections remain secure as long as either component holds. The feature requires OpenSSL 3.5+ and the OpenSSL provider configuration in Neo4j Enterprise Edition. A Docker-based setup example is provided, along with verification steps using openssl s_client. Post-quantum certificate authentication (ML-DSA, Merkle Tree Certificates) is planned for a future release. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Post-Quantum Cryptography for Authentication: The Enterprise Migration Guide 2026](https://daily.dev/posts/post-quantum-cryptography-for-authentication-the-enterprise-migration-guide-2026-i5hayeibm) · Security Boulevard · 0 upvotes · 0 comments - [Harvest Now, Decrypt Later: The Threat to Key Exchange – Quantum Series, Part 2](https://daily.dev/posts/harvest-now-decrypt-later-the-threat-to-key-exchange-quantum-series-part-2-eadei5fjg) · Cisco · 0 upvotes · 0 comments - [Beyond Encryption: The New Standards for Quantum-Resistant AI Infrastructure](https://daily.dev/posts/beyond-encryption-the-new-standards-for-quantum-resistant-ai-infrastructure-buiwlhsgi) · Security Boulevard · 0 upvotes · 0 comments - [Post-Quantum Hybrid Key Exchange for TLS 1.3 – Inside.java](https://daily.dev/posts/post-quantum-hybrid-key-exchange-for-tls-1-3-inside-java-dumdzgplr) · Inside Java · 0 upvotes · 0 comments --- Tags: [#backend](https://daily.dev/tags/backend), [#quantum-computing](https://daily.dev/tags/quantum-computing), [#cryptography](https://daily.dev/tags/cryptography), [#neo4j](https://daily.dev/tags/neo4j) [View this post on daily.dev](https://daily.dev/posts/how-do-you-defend-neo4j-against-quantum-computers--z212t2etd)