Post-quantum protection is now available as an optional feature in Proton Mail across all plans, including the free tier. How post-quantum protection works Once enabled, Proton Mail generates new encryption keys designed to protect future encrypted emails against attacks from quantum computers. Because the feature relies on new encryption keys, users need updated Proton apps that support post-quantum protection. Older app versions do not support the new keys. “Enabling PQC helps protect new encrypted emails … More →
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