[Cryptography] Signal double-ratchet vs. future breaks in ECC?

Nemo nemo at self-evident.org
Fri Jul 27 12:41:33 EDT 2018

I asked this on the Crypto StackExchange but got no replies:


I understand how a "double ratchet" protects both future and past
messages from one-time key compromise.

My question is what happens if the public key (ECC) algorithm is broken,
while the hash function(s), symmetric algorithm(s), and keys themselves
remain secure. (Consider a hypothetical mathematical breakthrough on
elliptic curves, or quantum computers becoming practical...)

Perhaps somebody here knows the answer or can explain why it is a dumb


 - Nemo

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