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HoloCompute Threat Model

Overview

This document describes the security threats and mitigations for HoloCompute, a distributed memory and compute virtualization layer. The threat model follows the STRIDE methodology to identify and categorize potential security risks.

Assets

Primary Assets

  1. Cluster Data: Shared arrays, distributed buffers, and computation results
  2. Node Resources: CPU, memory, GPU, and storage across the cluster
  3. Network Communications: Control plane and data plane messages
  4. Node Identities: Ed25519 keys and node credentials
  5. Cluster State: Membership information, shard assignments, ring topology

Secondary Assets

  1. Configuration Data: Cluster settings, policies, and tuning parameters
  2. Audit Logs: Security and operational logs
  3. Performance Metrics: Observability data and profiling information
  4. User Code: WASM modules and plugin implementations

Trust Boundaries

  1. Intra-Cluster: Nodes within the same HoloCompute cluster
  2. Inter-Cluster: Connections between different HoloCompute clusters
  3. Administrative: Cluster operators and system administrators
  4. User Applications: Client code using the HoloCompute API
  5. External Services: Plugin providers and hardware accelerators

STRIDE Threat Analysis

Spoofing

Threat Description Impact Mitigation
Node Impersonation Attacker pretends to be a legitimate cluster node Unauthorized access to data and resources Ed25519 public key authentication, trust-on-first-use or pre-shared key pinning
Client Impersonation Attacker pretends to be a legitimate client Unauthorized cluster access and resource consumption Token-based authentication with RBAC
Message Spoofing Attacker injects fake control or data plane messages Cluster state corruption, data tampering Noise protocol with AEAD, message authentication

Tampering

Threat Description Impact Mitigation
Data-in-Transit Attacker modifies messages between nodes Data corruption, computation errors AEAD encryption (Noise over QUIC)
Data-at-Rest Attacker modifies stored pages or metadata Data corruption, privacy breach Optional page encryption, BLAKE3 checksums
Configuration Tampering Attacker modifies cluster configuration Service disruption, security policy bypass File integrity checks, configuration signing
Code Tampering Attacker modifies WASM modules or plugins Code execution, data exfiltration Module hashing, secure plugin interfaces

Repudiation

Threat Description Impact Mitigation
Action Repudiation Node or client denies performing an action Audit failure, non-repudiation issues Comprehensive logging, digital signatures
Message Repudiation Node denies sending a message Protocol disputes, fault investigation Message sequence numbers, cryptographic signatures

Information Disclosure

Threat Description Impact Mitigation
Eavesdropping Attacker intercepts network communications Data exposure, credential theft End-to-end encryption (Noise over QUIC)
Memory Dumping Attacker accesses node memory Data exposure, key extraction Secure memory management, key encryption
Log Exposure Sensitive data in logs Privacy breach, credential leakage Log redaction, structured logging controls

Denial of Service

Threat Description Impact Mitigation
Resource Exhaustion Attacker consumes CPU, memory, or network Service unavailability, performance degradation Resource quotas, rate limiting, backpressure
Message Flooding Attacker sends excessive control messages Control plane overload, membership instability Rate limiting, message prioritization
Task Bombing Attacker submits excessive compute tasks Resource starvation, queue overload Task quotas, admission control

Elevation of Privilege

Threat Description Impact Mitigation
Role Escalation User gains unauthorized privileges Unauthorized actions, data access RBAC with least privilege principle
Node Promotion Unauthorized node becomes cluster member Cluster compromise, data access Bootstrap security, membership voting
Plugin Escalation Malicious plugin gains system access Host compromise, data breach WASM sandboxing, plugin isolation

Security Controls

Transport Security

  • Protocol: Noise over QUIC with XChaCha20-Poly1305 or AES-GCM
  • Key Exchange: Hybrid KEM (X25519 + ML-KEM-768) with feature flag
  • Post-Quantum: Optional lattice-based cryptography for quantum resistance
  • Certificate Pinning: Trust-on-first-use or pre-shared key validation

Access Control

  • Authentication: Ed25519 public key infrastructure
  • Authorization: Role-based access control (RBAC)
  • Actions: ALLOCATE, RUN, DRAIN, SHUTDOWN with granular permissions
  • Tokens: JWT or similar token-based authentication for clients

Data Protection

  • Encryption: XChaCha20-Poly1305 or AES-GCM for transport
  • At-Rest: Optional AES-256 encryption for spilled pages
  • Integrity: BLAKE3 checksums for page validation
  • Key Management: Secure key generation, storage, and rotation

Execution Security

  • Sandboxing: WASM runtime with restricted syscalls
  • Timeouts: Deterministic execution limits
  • Resource Limits: CPU, memory, and I/O constraints
  • Plugin Isolation: gRPC interfaces with privilege separation

Observability

  • Logging: Structured, redacted logs with security events
  • Metrics: Security-related metrics (failed auth, rate limits)
  • Auditing: Comprehensive audit trail for sensitive operations
  • Monitoring: Anomaly detection for suspicious behavior

Deployment Considerations

Network Security

  • Firewall Rules: Restrict cluster ports to trusted networks
  • Network Segmentation: Isolate cluster traffic from other services
  • Ingress Control: Validate and filter incoming connections
  • Egress Control: Limit outbound connections from cluster nodes

Physical Security

  • Node Security: Secure physical access to cluster nodes
  • Key Storage: Hardware security modules for key protection
  • Boot Integrity: Secure boot and trusted platform modules
  • Firmware Updates: Verified firmware updates with rollback protection

Operational Security

  • Personnel Training: Security awareness for operators
  • Incident Response: Procedures for security incidents
  • Vulnerability Management: Regular scanning and patching
  • Backup Security: Encrypted, integrity-protected backups

Compliance Considerations

Data Privacy

  • GDPR: Data protection and privacy controls
  • HIPAA: Healthcare data handling requirements
  • SOX: Financial data integrity and audit controls
  • PCI DSS: Payment card data protection

Industry Standards

  • NIST: Cryptographic standards and key management
  • FIPS: Federal information processing requirements
  • ISO 27001: Information security management
  • SOC 2: Security, availability, and confidentiality controls

Mitigation Summary

HoloCompute implements defense-in-depth security through:

  1. Strong Encryption: Noise over QUIC with post-quantum options
  2. Authentication: Ed25519 public key infrastructure
  3. Authorization: RBAC with token-based access control
  4. Sandboxing: WASM runtime with restricted capabilities
  5. Observability: Comprehensive logging and monitoring
  6. Resilience: Rate limiting, backpressure, and fault tolerance
  7. Verification: Checksums, digital signatures, and integrity checks

These controls work together to provide a secure distributed computing environment while maintaining the performance and flexibility needed for heterogeneous computing clusters.