A quantum computer large enough to break RSA and elliptic curves does not need to exist yet to cause harm: anything recorded or signed today with classical cryptography alone is already on a clock. Every R-Series receipt is signed twice, classically and post-quantum.
Traffic, backups and signed archives are copied today and kept. When a cryptographically relevant quantum computer arrives, keys protected only by RSA or elliptic curves can be recovered, and signatures made with them can be forged after the fact. Records that must stay trustworthy for decades need a post-quantum leg now.
Every R-Series receipt carries both. ML-DSA-65 is the module-lattice signature standardised in NIST FIPS 204 at security category 3. A verifier refuses a receipt missing either signature.
For forces and systems that need the highest category, the same receipt format with ML-DSA-87, chosen per deployment. In development
Where a link carries secrets, a hybrid exchange (X25519 with ML-KEM-768, FIPS 203) protects the session, so recorded traffic stays closed.
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