EvgenyFeb 6
Delta Chat

It took a while but it's shaping up nicely :) Post-Quantum Cryptography and Reliable Deletion, better known as Forward Secrecy, are going to become available in 2026 in #deltachat. For more details, including the recent #fosdem26 talk recording:

https://autocrypt2.org

Autocrypt v2 - Post-Quantum and Reliable Deletion

Modern OpenPGP v6 certificate with post-quantum cryptography, reliable deletion, and transport-agnostic messaging for decentralized systems.

Feb 6 at 12:51amWeb
Show threadMilk🥛Feb 6
@delta Спасибо за отличный мессенджер❤️🥛
Show threadKoutsie Feb 6

@delta LETS GO?

allright fuck it, ig Delta chat it'll be then sighhh

Show threadCadenFeb 6
@delta this is huge. Forward secrecy is the killer Signal feature that ive been waiting for on Delta
Show threadBenjamin Kwiecień 🇵🇸Feb 6
@delta whoa 😳
Show threadziviFeb 6
@delta will there be a possibility of unable to decrypt errors if one of the parties in a chat is offline (with their devices powered off, and such) for over 10 days and then comes back?
Show threadDelta ChatFeb 6
@zaire should be fine, see also https://www.ietf.org/archive/id/draft-autocrypt-openpgp-v2-cert-01.html#section-4.1.4
When coming online a device will first ingest pending messages, then destroy expired decryption keys.
Autocrypt v2 OpenPGP Certificates and Transferable Secret Keys

This document describes the "Autocrypt v2 Certificate", a standard structure for an OpenPGP certificate for Internet messaging. It offers defense against store-now-decrypt-later attacks from quantum computers through post-quantum hybrid cryptography. It also enables reliable deletion ("Forward Secrecy") of received messages even when adversaries capture encrypted messages in transit and later compromise the user's message archive and secret keys. The design uses deterministically ratcheted rotating encryption subkeys with predictable expiration combined with coordinated secret key material destruction. This document also describes the structure, use, and maintenance of the OpenPGP Transferable Secret Key that corresponds with the Autocrypt v2 Certificate.

Show threadziviFeb 6
@delta speaking of deletion, does delta chat do anything to ensure deleted messages are gone for good from the device (so the data isn’t recoverable via forensics tools even if applied right away)?
Show threadDelta ChatFeb 6
@zaire Unfortunately, on systems which use flash storage like a typical smartphone or laptop with SSDs, the application can't influence when data is getting overwritten, unless it overwrites all unallocated space with zeros: https://www.baeldung.com/linux/wipe-free-space#bd-overview
Wipe Free Space in Linux | Baeldung on Linux

Explore various solutions to wipe free space and remove confidential data from a disk in Linux.

Baeldung on Linux
Show threadTrisFeb 6
@delta @Tutanota interoperability when
Show threadLordJonasFeb 6
@delta @dieg0