[darwinwhy]

Sparse Post-Quantum Ratchet, or SPQR. Someone at Signal is a Roman history enjoyer.

[lo_zamoyski]

How often do you think about the Roman Empire?

[throw0101d]

Not very. But the Roman Republic…

[ziofill]

Or Asterix

[saurik]

Or, just maybe, they are merely an enjoyer of chat apps (SPQR -> "speaker").

[dmesg]

The (very weak) Caesar cipher was used in ancient Rome though and cryptography in general way before. It could be a silent nod to how far our achievements have gone and that encryption is a basic human desire since millennia.

[a022311]

Or maybe this SPQR is weak too /s