The FL-CL (Federated Learning - Continual Learning) collaborative cyber defense system is engineered from the ground up to operate in high-threat, multi-tenant, and regulated enterprise environments. It enforces strict privacy preservation, cryptographic verification, and Byzantine adversarial resilience across every architectural layer.
┌────────────────────────┬──────────────────────────────────┬────────────────────────────────────────────────────────┐
│ Threat Category │ Adversary Capability │ Architectural Mitigation & Security Invariant │
├────────────────────────┼──────────────────────────────────┼────────────────────────────────────────────────────────┤
│ 1. Data Exfiltration │ Passive eavesdropping on transit │ Zero raw packet transmission; flows isolated in │
│ & Interception │ or physical network links. │ ephemeral tmpfs RAMDisks; gRPC over TLS. │
├────────────────────────┼──────────────────────────────────┼────────────────────────────────────────────────────────┤
│ 2. Gradient Inversion │ Reconstructing raw network flows │ Client-side DP-SGD (C=1.0, sigma=0.30); coordinate │
│ (Model Inversion) │ from shared weight updates. │ aggregation over batched mini-updates. │
├────────────────────────┼──────────────────────────────────┼────────────────────────────────────────────────────────┤
│ 3. Byzantine Poisoning │ Compromised defender nodes flip │ Robust Aggregation: TrimmedMean (beta=0.10), FedMedian,│
│ & Gradient Attacks │ labels (0->4) or flip signs. │ and Krum neutralize malicious outlier updates. │
├────────────────────────┼──────────────────────────────────┼────────────────────────────────────────────────────────┤
│ 4. NaN / Inf Injection │ Malicious floating point corrupts│ Aggregator NaN/Inf guard sanitizes perturbed weight │
│ Exploits │ server-side aggregation. │ entries to 0.0 prior to assembly. │
├────────────────────────┼──────────────────────────────────┼────────────────────────────────────────────────────────┤
│ 5. Supply Chain & Code │ Unauthorized tampering with model│ SHA-256 cryptographic dataset lineage graph, Git commit│
│ Drift Tampering │ checkpoints or training flows. │ hash tagging, and TorchScript dynamic compilation. │
└────────────────────────┴──────────────────────────────────┴────────────────────────────────────────────────────────┘
Raw packet captures and IP payloads never leave the local defender node. NFStream extracts 32 statistical flow features (packet counts, directional byte volumes, durations, PIAT distributions) directly into a volatile in-memory tmpfs RAMDisk (/mnt/ramdisk/flows/). Only privacy-preserving parameter weights (
-
Gradient Clipping: Bounded by maximum gradient norm
$C = 1.0$ prior to momentum accumulation. -
Calibrated Noise Multiplier:
$\sigma = 0.30$ . -
Formal Privacy Guarantee: Under Moments Accountant analysis,
$T=100$ rounds at$\delta = 10^{-5}$ yields a tight$(\epsilon \le 6.08)$ differential privacy guarantee, mathematically proving that individual network flow records cannot be reconstructed from global weights.
Aggregator supports coordinate-wise and distance-based secure aggregation:
-
TrimmedMean($\beta=0.10$ ): Trims top/bottom$\beta$ fraction of extreme parameter updates per coordinate. -
FedMedian: Coordinate-wise median aggregation immune to arbitrary sign-flipping. -
Krum/MultiKrum: Selects candidate vectors minimizing Euclidean distance to$n - f - 2$ neighbors.
┌────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ LEGAL & REGULATORY COMPLIANCE VERIFICATION │
├───────────────────────┬────────────────────────────────────────────┬───────────────────────────────────────────────┤
│ Statute / Framework │ Legal / Regulatory Mandate │ FL-CL Architectural Implementation & Evidence │
├───────────────────────┼────────────────────────────────────────────┼───────────────────────────────────────────────┤
│ 1. UU PDP No. 27/2022 │ Strict prohibition of unauthorized transfer│ Zero Raw Flow Transmission: Raw network flows │
│ (Indonesia PDP) │ of personal data outside authorized secure │ remain exclusively in local volatile tmpfs │
│ Articles 65 & 66 │ jurisdiction boundaries. │ RAMDisks; only weight updates cross subnets. │
├───────────────────────┼────────────────────────────────────────────┼───────────────────────────────────────────────┤
│ 2. GDPR (EU 2016/679) │ Article 5: Data Minimization & Purpose │ DP-SGD (sigma=0.30, C=1.0) & ephemeral tmpfs │
│ Articles 5, 25, 32 │ Article 25: Privacy by Design & Default │ storage enforce cryptographic pseudonymization│
│ │ Article 32: Security of Processing │ and irreversibility of model weights. │
├───────────────────────┼────────────────────────────────────────────┼───────────────────────────────────────────────┤
│ 3. NIST SP 800-94 / │ Standards for Network Intrusion Detection │ 32-Dimensional Statistical Flow Representation│
│ NIST SP 800-145 │ and Prevention Systems (IDPS); continuous │ without payload inspection; per-class recall │
│ │ behavioral anomaly verification. │ tracking and automated promotion gates. │
├───────────────────────┼────────────────────────────────────────────┼───────────────────────────────────────────────┤
│ 4. MITRE ATT&CK │ Standardized adversary tactic, technique, │ Validated Threat Coverage: │
│ Enterprise Matrix │ and procedure (TTP) categorization. │ - T1498 (Network Denial of Service / Slowloris)│
│ │ │ - T1110 (Brute Force / SSH Authentication) │
│ │ │ - T1048 (Exfiltration Over Alternative Port) │
│ │ │ - T1071 (Application Layer C2 Protocol Beacon)│
├───────────────────────┼────────────────────────────────────────────┼───────────────────────────────────────────────┤
│ 5. ISO/IEC 27001 / │ Information Security & Privacy Information │ Cryptographic Provenance Lineage: SHA-256 │
│ ISO/IEC 27701 │ Management System (ISMS/PIMS) controls. │ flow hashes, Git commit tags, MLflow audit log│
├───────────────────────┼────────────────────────────────────────────┼───────────────────────────────────────────────┤
│ 6. RFC 1035 / 793 / │ Wire-level protocol compliance for DNS, │ Dual-Engine Generator (--engine auto|kali) │
│ RFC 7230 / 7540 │ TCP state machines, and HTTP transports. │ generates valid RFC datagrams & TCP sessions. │
└───────────────────────┴────────────────────────────────────────────┴───────────────────────────────────────────────┘
If you identify a potential security vulnerability, memory safety issue, or compliance deviation within the fl-cl codebase, please submit a private report to the project maintainers.
- Initial Acknowledgment: Within 24 hours.
- Triage & Remediation Plan: Within 72 hours.
- Coordinated Security Patch: Released alongside automated verification regression tests in
tools/.