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Infrastructure Security

Architecture Overview​

Karpous infrastructure is designed with zero-trust principles and defense in depth. Every layer assumes the previous layer may be compromised.

Server Security​

Operating System Hardening​

MeasureImplementation
OSLatest Ubuntu LTS with security patches
KernelHardened with grsecurity options
ServicesMinimal - only essential services enabled
UsersNo root SSH, key-based auth only
FirewallUFW with default deny policy

Network Zones​

Firewall Rules​

SourceDestinationPortAction
InternetLoad Balancer443Allow
Load BalancerApp Servers8080Allow
App ServersDatabase5432Allow
App ServersRedis6379Allow
***Deny

Database Security​

Encryption​

At Rest​

  • Algorithm: AES-256-GCM
  • Key Management: AWS KMS / HashiCorp Vault
  • Rotation: Automatic key rotation every 90 days

In Transit​

  • Protocol: TLS 1.3 minimum
  • Certificates: Auto-renewed via Let's Encrypt / AWS ACM
  • Cipher Suites: Modern, secure suites only

Access Control​

Access TypeMethod
ApplicationConnection string from secret manager
AdminBastion host + MFA + audit logging
BackupAutomated, encrypted, separate credentials
AnalyticsRead replica, separate credentials

Backup Strategy​

Backup TypeFrequencyRetentionLocation
Full BackupDaily30 daysEncrypted S3
Point-in-TimeContinuous7 daysTransaction logs
Cross-RegionDaily14 daysSecondary region

API Security​

Authentication Flow​

JWT Token Structure​

{
  "header": {
    "alg": "RS256",
    "typ": "JWT"
  },
  "payload": {
    "sub": "user_id",
    "iat": 1234567890,
    "exp": 1234568790,
    "iss": "karpous.com",
    "aud": "karpous-api",
    "scope": ["read", "write"],
    "device_id": "fingerprint_hash"
  }
}

Rate Limiting Strategy​

Request Validation​

CheckImplementation
Schema ValidationJSON Schema validation on all inputs
Type CheckingStrict type enforcement
Size LimitsMax request body: 1MB
SQL InjectionParameterized queries only
XSSContent sanitization, CSP headers
CSRFToken-based protection

Secret Management​

Secret Hierarchy​

Rotation Policy​

Secret TypeRotation FrequencyMethod
Database Credentials30 daysAutomatic
API Keys90 daysManual with notification
JWT Signing Keys180 daysRolling deployment
Encryption Keys365 daysKMS managed

DDoS Protection​

Cloudflare Configuration​

FeatureSetting
DDoS ProtectionEnterprise tier
WAFOWASP Core Rule Set
Bot ManagementChallenge suspicious traffic
Rate LimitingTiered by endpoint
SSL/TLSTLS 1.3, strict mode

Attack Mitigation​

Logging & Monitoring​

Log Pipeline​

Monitored Metrics​

CategoryMetricsAlert Threshold
APIResponse time, error rateOver 500ms, Over 1%
DatabaseQuery time, connectionsOver 100ms, Over 80%
SecurityFailed logins, unusual IPsOver 10/min, geofence
BlockchainTransaction failuresAny failure
InfrastructureCPU, memory, diskOver 80% usage

Alert Escalation​

Compliance​

Data Protection​

RequirementImplementation
GDPRData minimization, right to deletion
Data ResidencyRegional data storage options
Audit LoggingImmutable audit trail
Access Logs90-day retention

Security Standards​

StandardStatus
SOC 2 Type IIIn Progress
ISO 27001Planned
PCI DSSNot applicable (no card data)

Disaster Recovery​

Recovery Objectives​

MetricTarget
RTO (Recovery Time Objective)4 hours
RPO (Recovery Point Objective)1 hour

Failover Strategy​

Backup Verification​

  • Daily: Automated backup integrity check
  • Weekly: Restore test to isolated environment
  • Monthly: Full DR simulation