# VII. Trust ### 7.1 Security Objective and Trust Contract 7.1.1 **Objective.** Nexus Platforms must be safe enough for high-sensitivity expert communities (finance, critical infrastructure, cyber/outage, health, sovereign planning) while remaining lightweight, cloneable, and community-operated. The security posture therefore treats **governance, handling, and correctionability** as first-class controls—not “policy documents”—and implements a provable chain: **who accessed what, under what authority, at what handling class, for what purpose, and what was published under what reliance bounds**. 7.1.2 **Trust contract (what experts and institutions can rely on).**\ a. **Standing is deterministic:** only record-valid acts confer authority, roles, releases, and governance decisions.\ b. **Handling is enforceable:** Public-Safe, Controlled, Restricted are separated by design (access gates, indices, retention, distribution logs).\ c. **Everything is auditable:** identity, access, retrieval, exports, form submissions, workflow transitions, releases, corrections, and disputes are evidence-grade logs with retention and legal hold.\ d. **No silent change:** released objects are immutable; changes occur through correction/supersession with diffs and migration notes.\ e. **Non-executing perimeter is hard-coded:** the platform cannot be used as an operational command system, procurement steering mechanism, or regulated execution layer. 7.1.3 **Sovereign safety doctrine.** Nexus Platforms adopt a “minimize data movement; maximize artifact movement” rule and treat sovereign deployment modes (Local / Federated Compute-to-Data / Hybrid) as security primitives. Security controls must remain consistent across clones, while jurisdiction overlays tailor identity, retention, and disclosure obligations. *** ### 7.2 Identity, Authentication, and Institutional Access (IAM, MFA, Federation) 7.2.1 **Identity primitives (Nexus Passport + ILA).** Each user identity includes: role eligibility evidence, domain affiliations, jurisdiction markers, handling election defaults, COI status, and participation portfolio. Identity is never treated as a single “member/admin” switch; it is the basis for fine-grained authorization and audit. 7.2.2 **Authentication tiers.**\ a. **Baseline authentication:** secure login, strong password policy, device/session management, anomaly detection.\ b. **Step-up authentication:** mandatory multi-factor authentication for any Controlled or Restricted access, role acceptance, release actions, and bulk exports.\ c. **Institutional federation:** optional single sign-on for partners (national/regional/institutional clones) with mapping of institutional groups to Nexus role markers and handling lanes.\ d. **Break-glass access:** emergency access pathways exist only for platform continuity and incident containment, require step-up authentication, are time-boxed, and are automatically escalated into audit review. 7.2.3 **Identity assurance levels.** Nexus supports graded identity confidence to match sensitivity: * **Self-asserted** (public participation) * **Community-verified** (peer-attested domain standing) * **Institution-verified** (affiliated institution validates employment/role) * **Sovereign-verified** (national authority attests for sovereign lanes, where applicable)\ The platform never treats identity assurance as “authority to decide”; it only affects eligibility and handling gates. *** ### 7.3 Authorization Model (RBAC + ABAC + Purpose Binding) 7.3.1 **Role-based access control (RBAC) as the minimum.** Nexus defines clear platform roles and scopes: observer, contributor, reviewer, maintainer, steward, records officer, handling officer, security officer, and platform operator. Roles are activated only through **role-marker records** with term, scope, and revocation conditions. 7.3.2 **Attribute-based access control (ABAC) .** Access to Controlled/Restricted objects must also evaluate attributes such as: jurisdiction, institutional affiliation, guild membership, COI state, credit thresholds, purpose selection, export permissions, and time window. 7.3.3 **Purpose binding (high-trust differentiator).** For Controlled/Restricted access, Nexus requires a declared purpose (e.g., review, replication, conformance run, drafting, dispute resolution). Purpose is recorded and linked to distribution logs. This directly supports sovereign comfort: access is not just “who,” it is “why.” 7.3.4 **Separation of duties (SoD).** Nexus prevents a single actor from doing all high-impact steps by default:\ a. drafters cannot unilaterally publish releases into Controlled/Restricted lanes;\ b. release approval requires independent reviewer and handling review;\ c. security/handling roles cannot self-approve their own releases;\ d. platform operators cannot silently alter governance objects without creating records and triggering audit review. *** ### 7.4 Privileged Access Management (PAM) and Administrative Hardening 7.4.1 **Administrative domains.** Nexus separates:\ a. **Platform operations** (infrastructure and performance)\ b. **Governance operations** (records, releases, corrections)\ c. **Content maintenance** (drafting, editing, templating)\ d. **Security and handling** (access policy, incident controls)\ Each domain has distinct privileges, limited personnel, and audit triggers. 7.4.2 **Privileged session controls.**\ a. time-boxed admin sessions;\ b. step-up authentication;\ c. IP/device restrictions where feasible;\ d. mandatory session logging for privileged actions;\ e. “two-person rule” for sensitive configuration changes (handling policies, export rules, retention schedules). 7.4.3 **Secrets management discipline.** API keys, encryption secrets, provider credentials, and webhook secrets must be: isolated per environment, rotated, access-logged, and never embedded into content objects. Sovereign clones require local ownership of secrets whenever demanded by law or policy. *** ### 7.5 Handling Enforcement: Data Protection, DLP, and Distribution Logs 7.5.1 **Handling class controls (enforcement, not labels).** * **Public-Safe:** broad indexing, caching/edge acceleration permitted, open export feeds enabled. * **Controlled:** access-gated, distribution logging mandatory, expiry enforced, export limits applied. * **Restricted:** strict eligibility, distribution logging mandatory, staged release enforced, public-safe abstract required, exports tightly controlled and monitored. 7.5.2 **Distribution logs (audit-grade).** For Controlled/Restricted, Nexus records: object ID, version, accessor identity, purpose, timestamp, delivery method, expiry date, and revocation status. Logs support “recall” behavior: when a release is withdrawn/superseded or access is revoked, the platform can enforce expiry and flag downstream reliance. 7.5.3 **Data loss prevention posture (practical within your operating surface).**\ a. expiring links for Controlled/Restricted downloads;\ b. watermarking for controlled exports (user, time, version);\ c. rate limits and export quotas by role and handling class;\ d. bulk export requires explicit approval record;\ e. restricted content is never copied into public indices; retrieval is hard-partitioned. 7.5.4 **Staged release automation as a hard gate.** Any Controlled/Restricted release must include: (i) public-safe abstract; (ii) limitations/uncertainty; (iii) redaction statement; (iv) non-operational framing. This is enforced as a release blocker and a handling review checkpoint. *** ### 7.6 Encryption, Key Custody, and Tenant Isolation 7.6.1 **Encryption baseline.**\ a. encryption in transit for all traffic;\ b. encryption at rest for databases, object storage, and index stores;\ c. strong hashing for integrity proofs and audit log anchoring. 7.6.2 **Tenant isolation model.** For national/regional/institutional deployments, Nexus supports isolation of:\ a. content stores (objects, releases, attachments)\ b. indices (public/controlled/restricted)\ c. audit logs\ d. secrets and provider routing rules\ This prevents cross-tenant leakage and enables sovereign partners to own their data and policies. 7.6.3 **Key custody options.** Nexus supports tiers: * platform-managed keys (low friction, suitable for public-safe deployments) * partner-managed keys (sovereign or institutional) for controlled/restricted lanes * per-tenant key rotation schedules and emergency revocation *** ### 7.7 Audit Logging, Evidence, and Retention (Operational Proof, Not Claims) 7.7.1 **Immutable audit logging scope.** Nexus logs must cover:\ a. authentication events and step-up challenges\ b. role marker issuance/revocation\ c. form submissions and workflow transitions\ d. assistant retrieval footprints (which index, which objects consulted)\ e. exports/downloads and distribution logs\ f. publication events (releases, corrections, withdrawals)\ g. admin configuration changes (handling policies, access rules, retention settings) 7.7.2 **Retention schedules by handling class.**\ a. public-safe: long retention for public registers and releases;\ b. controlled: retention aligned to purpose and partner policy, with mandatory expiry and renewal logic;\ c. restricted: stricter retention, legal hold capability, and auditable destruction pathways with attestations. 7.7.3 **Legal hold and investigation readiness.** Nexus supports “hold” flags that pause deletion for relevant objects/logs while preserving access controls and maintaining an investigation chain of custody. 7.7.4 **Audit exports (safe and bounded).** Audits produce structured reports: access summaries, release lineage, correction timelines, role assignment histories, and distribution logs—always respecting handling constraints and sovereignty overlays. *** ### 7.8 Operational Resilience: Backups, DR, SLOs, and Restore Discipline 7.8.1 **Continuity tiers.** Nexus defines continuity by handling: public-safe services can prioritize availability; controlled/restricted services prioritize confidentiality and integrity, even if that reduces convenience during incident conditions. 7.8.2 **Backup and restore discipline.**\ a. scheduled backups for content stores, configuration, indices, and audit logs;\ b. encrypted backups with separate access controls;\ c. periodic restore drills with documented outcomes;\ d. “known good” rollback points for platform upgrades and semantic spine updates. 7.8.3 **RPO/RTO posture.** Nexus declares recovery objectives by deployment tier and agrees them with partners: public registers may target faster restore; restricted lanes may require additional validation checks before resuming service. 7.8.4 **Service objectives (SLOs).** Nexus defines measurable SLOs: uptime, indexing latency, search latency, release publication pipeline timeboxes, and incident response clocks—so institutions can operationalize trust without ambiguity. *** ### 7.9 Secure Configuration, Change Control, and Supply-Chain Posture 7.9.1 **Configuration as controlled assets.** Governance workflows, handling rules, release blockers, assistant policies, and routing rules are treated as versioned configuration assets with: review, approval, rollback, and audit trails. 7.9.2 **Change approval gates.** Any change that affects handling boundaries, export behavior, access rules, or release blockers requires: two-person review, time-boxed deployment window, and post-change verification tests. 7.9.3 **Dependency and component integrity (supply chain).** Nexus maintains a platform component inventory and monitors: updates, vulnerabilities, and patch clocks. High-sensitivity deployments adopt faster patch cycles and stricter validation. 7.9.4 **Content supply chain controls.** External imports (feeds, URLs, bulk ingestion) are routed through triage and rights checks; they do not auto-publish into release lanes and do not auto-enter controlled/restricted indices without admission tests. *** ### 7.10 Abuse Resistance: Rate Limits, Bot Control, Anti-Scrape, and Community Safety 7.10.1 **Traffic controls.** Nexus employs layered rate limiting, bot mitigation, and abuse detection tuned for knowledge platforms: brute force prevention, comment spam mitigation, scraping defenses, and anomaly alerts for mass exports or unusual retrieval patterns. 7.10.2 **Assistant abuse controls.** Domain assistants enforce:\ a. refusal patterns for operational directives and sensitive exploitation guidance;\ b. leakage tests and “no cross-index retrieval” guarantees;\ c. token and usage quotas by role;\ d. escalation pathways to handling/security officers on repeated abuse patterns. 7.10.3 **Community safety and conduct.** Conduct enforcement is implemented as workflows: warnings, temporary restrictions, role revocation, and sanctions ladder—always recorded as governed actions to maintain due process and auditability. *** ### 7.11 Incident Response and Disclosure (Breach-Ready, Sovereign-Compatible) 7.11.1 **Incident categories.** Nexus recognizes incident classes that map to response runbooks: credential compromise, data exposure, handling boundary breach, malicious content injection, defacement, provider outage, supply chain vulnerability, insider misuse, and sovereignty-policy violations. 7.11.2 **Response mechanics.**\ a. containment actions (disable exports, restrict indices, revoke tokens, freeze role markers)\ b. forensics (preserve logs, legal hold, access timeline reconstruction)\ c. communications integrity (publish controlled disclosures with handling discipline)\ d. recovery (restore, validate indices, regression test assistants, re-open access in stages) 7.11.3 **Vulnerability intake lane.** Nexus provides a responsible disclosure intake with response clocks, severity scoring, and published remediation notes where safe—building credibility with expert communities and partners. 7.11.4 **Provider incident handling (AI-agnostic reality).** Nexus treats model/service provider disruptions as incidents: routing policy can fail over to alternate providers, degrade gracefully to non-AI workflows, and enforce “restricted lane pause” when safe operations cannot be assured. *** ### 7.12 Sovereign Deployment Security Patterns (Local, Federated Compute-to-Data, Hybrid) 7.12.1 **Local sovereign mode (air-gappable).**\ a. platform runs entirely within partner perimeter;\ b. indices and logs remain local;\ c. public-good extracts are exported via controlled release gates;\ d. external federation is metadata-only unless explicitly authorized. 7.12.2 **Federated compute-to-data mode.**\ a. tasks and work packages are routed to the partner zone;\ b. compute executes near the data under partner control;\ c. outputs return only as approved artifacts/results with attestations;\ d. retrieval remains permissioned and logged end-to-end. 7.12.3 **Hybrid tiered mode.**\ a. public-safe content can be globally discoverable and cached;\ b. sensitive datasets and appendices remain in sovereign perimeter;\ c. controlled deliverables are staged and logged;\ d. restricted deliverables require strict eligibility and purpose binding. *** ### 7.13 Outputs 7.13.1 **Sovereign acceptability:** partners can adopt Nexus without centralizing sensitive data and without losing jurisdictional control.\ 7.13.2 **Work reliability:** measurable SLOs, restoration discipline, and audit logs turn “trust” into operational proof.\ 7.13.3 **Handling integrity:** Controlled/Restricted collaboration becomes practical without informal backchannels and without accidental leakage.\ 7.13.4 **Community scalability:** self-organization can grow while preserving safety, neutrality, and due process.\ 7.13.5 **Future-proof portability:** cloud and provider portability are treated as resilience features, not migration emergencies. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. 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