Issues

• SPQR specification Rev4: KDF_SCKA_CK input binding and receive-counter clarification

  signalapp/SparsePostQuantumRatchet#19 · Filter by author MIV009 opened on Oct 17, 2026

• Receiving future-epoch messages: spec ignores, code errors

  signalapp/SparsePostQuantumRatchet#7 · Filter by author astefano opened on Apr 30, 2026

• Ct1Acknowledged.Receive accepts Ek chunks not described by the spec

  signalapp/SparsePostQuantumRatchet#6 · Filter by author astefano opened on Apr 30, 2026

• Ct1Ack is defined in the spec but doesn't seem to be emitted

  signalapp/SparsePostQuantumRatchet#5 · Filter by author astefano opened on Apr 30, 2026

• spec and code disagree on HKDF salt / IKM

  signalapp/SparsePostQuantumRatchet#4 · Filter by author astefano opened on Apr 30, 2026