// DOUBLE ENCRYPTION

7-Layer Security Defense

SSL/TLS + Fernet message encryption + JWT + ACLs + code sandboxing + hashed passwords. Trust nothing, verify everything.

Real-World Use Case: Financial Trading Platform

Regulated financial system with PCI-DSS compliance. Every transaction must be encrypted, audited, and never leaked to unauthorized parties.

1. Layered Security Architecture

7-Layer Defense
// Layer 1: Network Firewall
IP whitelist, VPN required, no public access

// Layer 2: TLS 1.2+
HTTPS required, auto-renewing certificates

// Layer 3: Message Encryption
Fernet (AES-128) on every message payload

// Layer 4: JWT Authentication
15-minute access tokens, signature verification

// Layer 5: Group-Based ACLs
Fine-grained resource permissions

// Layer 6: Code Sandbox
RestrictedPython, subprocess isolation

// Layer 7: Data Hashing
SHA-256 passwords, checksums on files

Defense in Depth

  • If TLS is compromised, messages still encrypted
  • If encryption key leaked, JWT tokens invalid
  • If JWT token stolen, ACLs limit damage
  • If code access granted, sandboxing limits execution

No single point of failure in security. Each layer independent.

2. End-to-End Encryption Example

Complete Encryption Flow

When storing a credit card number in the vault:

  • Client reads card in app (never stored)
  • Sent via HTTPS (TLS 1.2+)
  • Message encrypted with Fernet before storage
  • Stored encrypted in database
  • Retrieved encrypted, decrypted on-demand
  • Access logged and audited
Vault Storage Flow
// Client submission (encrypted over TLS)
POST /api/v1.0/vault
{
  "name": "cc-4532",
  "value": "4532-1111-2222-3333"
}

// Server-side storage (Fernet encrypted)
database.vault: {
  id: "cc-4532",
  encrypted_value: "gAAAAABnzq...base64..."
}

// Access from orchestration
{
  "code": "charge_card({{vault.cc-4532}})",
  "action_type": "python"
}
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Compliance Ready

PCI-DSS, HIPAA, SOC 2 compliant encryption practices.

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Defense in Depth

Multiple layers mean compromising one doesn't break all security.

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Key Management

Automatic key rotation, no manual key handling required.

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Audit Trail

Every access logged for compliance and forensics.

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