Apple's Post-Quantum Cryptography Support in iOS 26, iPadOS 26, macOS Tahoe 26, and visionOS 26
2025-06-17
iOS 26, iPadOS 26, macOS Tahoe 26, and visionOS 26 now include support for post-quantum cryptography, negotiating quantum-safe key exchange (X25519MLKEM768) via TLS 1.3. This enhances security by preventing future quantum computers from decrypting TLS traffic. However, some legacy servers may fail to connect due to oversized ClientHello messages. Apple provides a temporary compatibility mode (`defaults write com.apple.network.tls AllowPQTLSFallback -bool true`) as a workaround, but this is a temporary solution.
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Quantum-Safe