Mention if messengers are quantum resistant

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For this page: The Best Private Instant Messengers - Privacy Guides

Signal: Signal >> Blog >> Quantum Resistance and the Signal Protocol

SimpleX Chat: SimpleX blog: SimpleX Chat v5.6 (beta): adding quantum resistance to Signal double ratchet algorithm, since v5.7 quantum resistant end-to-end encryption with all contacts.

  • unlike Signal design that only added quantum resistance to the initial key exchange by replacing X3DH key agreement scheme with post-quantum PQXDH, but did not improve Signal algorithm itself, our design added quantum-resistant key agreements inside double algorithm, making its break-in recovery property also quantum resistant.
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see also https://divested.dev/misc/pqc.txt

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Iā€™d like to just add that as a requirement honestly.

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This combined with Require Perfect Forward Secrecy for Real-Time Communications

is making the gap between the messengers wider and wider. It might be time to reevaluate the messenger category.