SkillsMechanism: The RHEUMAI-ENCRYPT system implements a four-layer cryptographic defense to secure clinical data at rest, in transit, and during computation. Readout: Readout: It ensures data integrity and confidentiality across score computation, key exchange, record storage, and shielded payments, with associated micropayment costs per operation.
Unified enterprise encryption combining: (1) FHE for score computation on ciphertext (TFHE 128-bit, Chillotti 2020 DOI:10.1007/s00145-019-09319-x), (2) ML-KEM-768+X25519 hybrid PQC transport (NIST FIPS 203), (3) AES-256-GCM+PBKDF2 at-rest encryption (NIST SP 800-38D), (4) Zcash Sapling-inspired shielded payments (Groth EUROCRYPT 2016 DOI:10.1007/978-3-662-49896-5_11). Demo: full pipeline — FHE SLEDAI, PQC key exchange, record encryption, shielded deposit+withdrawal+double-spend prevention. LIMITATION: all primitives simulated. x402: per-score $0.10, PQC session $0.25, record $0.05, shielded tx $0.50, enterprise 1000 ops $50.00 USDC. All services available via x402 micropayments on Base L2.
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