Every request is authenticated, authorized, content-scanned, and immutably logged before any data is returned. No exceptions.
Self-contained CA issues ephemeral 1-hour leaf certs at first connection. TLSv1.3 minimum on every hop. PKCS#11 HSM keeps root keys off the process heap. Replay attacks rejected via Redis nonce window (300 s default).
Every incoming request carries a posture score derived from MITRE tactic risk. Quarantined or decommissioned agents are rejected with 403 before any policy evaluation. An LRU cache (10 000 slots, 60 s TTL) prevents unbounded memory growth under high agent traffic.
Every tool call is tagged with ATT&CK Enterprise and ATLAS tactic IDs. A Redis Stream records call rate, payload size, and tool diversity per agent over a rolling 7-day window. Statistical deviation from the established baseline triggers a graduated response: warn at 50%, auto-quarantine at 75%. High-risk tactics (Exfiltration AML.TA0009, Impact AML.TA0010, Execution AML.TA0004) receive an immediate risk boost.
Every tool call is scanned for prompt injection, SQL injection, path traversal, SSRF/JNDI, and command injection. Outputs are redacted for PII: email, phone, IBAN, credit card, and national ID. Optional Presidio NLP enhancement runs in a thread pool to avoid blocking the event loop. Payload size is hard-blocked at 512 KiB by default.
Every audit event is appended to a tamper-evident SHA-256 chain. Each record includes prev_hash, a deterministic content hash, nanosecond timestamp, actor, and OTel trace ID. ChainVerifier detects any tampering. JSONL export for SIEM. Compatible with WORM storage. No DELETE ever.
Every tool call is evaluated against Open Policy Agent before execution. Gate by tenant, tool name, product scope, and time-of-day. OPA bundle hot-reloaded without gateway restart. Fail-closed: if OPA is unreachable, all calls are denied by default.
ArcaX security is enforced on every single tool call, at every layer, with no bypass possible for authenticated tenants. Transport: Ed25519 PKI, mTLS 1.3, 1-hour ephemeral certs, HSM PKCS#11 key storage, replay protection via Redis nonce window. Identity: Zero Trust posture score per agent, LRU-capped cache, agent FSM (active → quarantine → decommission). Behavior: MITRE ATT&CK Enterprise + ATLAS dual-framework tagging, Redis Stream 7-day behavioral baseline, statistical deviation scoring, auto-quarantine at 75%. Content: AI Shield scans every input for injection patterns (prompt, SQL, path traversal, SSRF) and redacts PII from every output. Forensics: Immutable SHA-256 hash chain, no DELETE ever, WORM-compatible JSONL export, OTel SIEM delivery. Policy: OPA evaluated per call, per tenant, per tool, fail-closed.
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