Security Overview

flowchart TB
subgraph Perimeter["Perimeter Security"]
WAF[Web Application Firewall]
DDoS[DDoS Protection]
RateLimit[Rate Limiting]
end

subgraph Application["Application Security"]
Auth[Authentication]
API[API Security]
Encryption[Data Encryption]
end

subgraph Infrastructure["Infrastructure Security"]
HSM[Hardware Security Module]
KMS[Key Management Service]
Audit[Audit Logging]
end

subgraph Monitoring["Security Monitoring"]
SIEM[SIEM System]
Alerts[Real-time Alerts]
Incident[Incident Response]
end

Perimeter --> Application
Application --> Infrastructure
Infrastructure --> Monitoring

flowchart LR
subgraph Creation["Key Creation"]
Generate[Generate API Key] --> Hash[Bcrypt Hash]
Hash --> Store[Store Hash Only]
end

subgraph Usage["Key Usage"]
Request[API Request] --> Validate[Bcrypt Compare]
Validate --> Allow[Allow/Deny]
end

subgraph Rotation["Key Rotation"]
New[New Key] --> Active[Active Key]
Active --> Deprecate[Deprecate Old]
Deprecate --> Remove[Remove Old]
end

flowchart LR
Client[Client] --> TLS[TLS 1.3] --> API[XentFi API]
API --> TLS2[TLS 1.3] --> Blockchain[Blockchain]

subgraph Security["Security Features"]
PFS[Perfect Forward Secrecy]
HSTS[HTTP Strict Transport Security]
CP[Certificate Pinning]
end

flowchart TB
Request[API Request] --> Auth{Authentication}
| Auth --> | Valid | Rate{Rate Limit} |
| -------- | ----- | ---------------- |

| Rate --> | Within Limit | Validate{Validation} |
| -------- | ------------ | -------------------- |

| Validate --> | Valid | Process[Process Request] |
| ------------ | ----- | ------------------------ |

Process --> Response[Return Response]

curl -X POST https://api.xentfi.com/v1/payment/links \
-H "Idempotency-Key: unique_key_123" \
...

flowchart LR
Traffic[Incoming Traffic] --> Shield[Cloudflare DDoS Shield]
Shield --> Filter[Traffic Filtering]
Filter --> Clean[Clean Traffic]
Clean --> Origin[Origin Servers]

flowchart TB
subgraph Public["Public Zone"]
LB[Load Balancer]
WAF[WAF]
end

subgraph App["Application Zone"]
API[API Servers]
Workers[Background Workers]
end

subgraph Data["Data Zone"]
DB[(Database)]
Cache[(Redis)]
KMS[(KMS)]
end

LB --> WAF --> API
API --> DB
API --> Cache
Workers --> DB
API --> KMS

flowchart LR
subgraph Sources["Data Sources"]
Logs[Application Logs]
Metrics[System Metrics]
Network[Network Traffic]
end

subgraph Analysis["Analysis"]
SIEM[SIEM Platform]
Rules[Detection Rules]
ML[Machine Learning]
end

subgraph Response["Response"]
Alert[Real-time Alerts]
Auto[Automated Response]
Manual[Manual Review]
end

Sources --> Analysis --> Response

flowchart LR
subgraph Testing["Testing Types"]
SAST[Static Analysis]
DAST[Dynamic Analysis]
Pen[Penetration Testing]
Audit[Code Audit]
end

subgraph Schedule["Schedule"]
Daily[Daily Scans]
Weekly[Weekly Scans]
Quarterly[Quarterly Tests]
Annual[Annual Audits]
end

Testing --> Schedule

stateDiagram-v2
[*] --> Detect: Monitoring Alert
Detect --> Analyze: Investigate
Analyze --> Contain: Confirmed
Contain --> Eradicate: Mitigation
Eradicate --> Recover: Remediation
Recover --> Postmortem: Resolved
Postmortem --> [*]: Lessons learned

flowchart LR
Production[Production Data] --> Replica[Replica in Primary Region]
Production --> Backup[Daily Backups]
Backup --> CrossRegion[Cross-Region Replication]
Backup --> Archive[Long-term Archive]