Comment on A fresh install of Signal takes up 410MB, blowing both Firefox and Chromium out of the water

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JoeyJoeJoeJr@lemmy.ml ⁨6⁩ ⁨months⁩ ago

There is no sharing of messages between linked devices - that would break forward secrecy, which prevents a successful attacker from getting historical messages. See the first bullet of: support.signal.org/…/360007320551-Linked-Devices

Messages are encrypted per device, not per user (signal.org/docs/specifications/sesame/), and forward secrecy is preserved (en.m.wikipedia.org/wiki/Forward_secrecy, for the concept in general, and signal.org/docs/specifications/doubleratchet/ for Signal’s specific approach).

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