Vincent RAMPAL
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Post quantum cryptography will affect Proton both for data at rest and data in transit.
I see your plan for GPG encryption quantum safe but could you please clarify for TLS/QUIC and certificates ?
Proton use encryption at different level:
* when Proton exchange mails with other mail servers (encryption in transit)
* when Proton verify the identity of other mail servers (certificate / signature)
* when Proton store mails using GPG (encryption at rest)
* when user connects to Proton servers (encryption in transit)
* when user verifies the identity of Proton servers (certificate / signature)
All of them needs to support post-quantum cryptography.
Post quantum crypto is supported in GPG since version 2.5.1.
Source: https://lists.gnupg.org/pipermail/gnupg-announce/2024q3/000485.html
NIST offer several standard of post quantum crypto.
Source: https://csrc.nist.gov/projects/post-quantum-cryptography/post-quantum-cryptography-standardization
Open Quantum Safe is also provide several solutions.
Project: https://openquantumsafe.org/
Presentations: https://www.douglas.stebila.ca/research/presentations/
Cloudflare is quite active on this topic and you can use it as a reference to see if you are above or bellow competition.
https://www.cloudflare.com/pqc/
https://blog.cloudflare.com/pq-2024/
https://pq.cloudflareresearch.com/