Data Flows - RFQX Security Architecture Package

High-Level Data Flow Diagram

Mermaid source

flowchart LR
  Req["Customer requirements"] -->|traceability evidence| ALM["ALM / evidence repository"]
  ALM -->|security concept and VnV reports| OEM["OEM customer"]
  Diag["Diagnostic tool"] -->|UDS requests, credentials| ECU["Electric Clutch Actuator ECU"]
  ECU -->|diagnostic responses, logs| Diag
  Net["Vehicle network"] <--> |signals, SDT / SecOC data, counters| ECU
  Backend["Backend / update service"] -->|software package, signature, IVD| ECU
  PKI["PKI"] -->|certificates and trust anchors| ECU
  ECU -->|security events, vulnerabilities| SecOps["Security operations"]
  SecOps -->|incident and mitigation feedback| ALM

Architecture Data Flow View

Data Flow View

Classification: Inferred from Requirements

The data-flow view tracks requirements/evidence, diagnostic traffic, vehicle data, software/update packages, key/certificate data, security events, and vulnerability/incident records.

Evidence Basis:

Requirement IDs: REQ-AUTO-00001; REQ_SEC_0001; REQ_SEC_0002; REQ-AUTO-00004; REQ-AUTO-00005; REQ-AUTO-00006; REQ_SEC_0003; REQ_SEC_0022; REQ-AUTO-00009; REQ_SEC_0023 (showing 10 of 379)
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Confidence level: Medium
Classification: Inferred from Requirements

Interface Data Flows

Flow	Direction	Data	Protection	Classification	Evidence
OEM/customer cybersecurity approval and evidence interface	Supplier security engineering -> vehicle manufacturer/OEM/customer	Requirements, risk assessment method/results, cybersecurity concept, control traceability, V&V evidence, residual-risk records.	Access control, evidence integrity, versioning, audit trail, customer approval workflow, confidentiality for security-sensitive reports.	Explicit Requirement	REQ-AUTO-00001; REQ_SEC_0001; REQ_SEC_0002; REQ-AUTO-00004; REQ-AUTO-00005; REQ-AUTO-00006; REQ_SEC_0003; REQ_SEC_0024 (showing 8 of 157)
Diagnostic/service tool to ECU interface	Diagnostic/service tool -> ECU diagnostic server/security services	UDS requests/responses, authentication data, certificates, session state, diagnostic security decisions, negative responses.	Authentication, authorization, secure session, certificate validation, rate limiting, replay protection, logging.	Explicit Requirement	REQ_SEC_0010; REQ_SEC_0011; req-6.20; REQ-AUTO-00282; REQ-AUTO-00284; REQ-AUTO-00290; REQ_UDS-0051; REQ_UDS-0051 (showing 8 of 385)
Vehicle network secure data communication interface	Other ECUs / vehicle network <-> product ECU/application	Signals, messages, SDT requests/responses, SecOC-protected data, freshness counters, authentication tags.	Message authentication, integrity, freshness, anti-replay, optional encryption, discard rules for malformed or unauthenticated data.	Inferred from Requirements	REQ-AUTO-00066; REQ-AUTO-00141; req-6.3; REQ-AUTO-00146; REQ-AUTO-00173; REQ-AUTO-00193; REQ-AUTO-00196; REQ-AUTO-00199 (showing 8 of 127)
Secure update, flash, and IVD interface	Update/flash backend or programming tool -> ECU update/boot/security services	Software packages, signatures, IVD data, certificates, programming requests, update result logs.	Package authenticity, integrity validation, secure boot linkage, certificate validation, rollback policy, logging.	Inferred from Requirements	REQ-AUTO-00203; REQ-AUTO-00279; REQ-AUTO-00284; REQ-AUTO-00290; REQ_UDS-0051; REQ-AUTO-00297; REQ-AUTO-00298; REQ-AUTO-00302 (showing 8 of 81)
Certificate and key provisioning interface	PKI/provisioning authority -> ECU security services / HSM	Keys, certificates, trust anchors, certificate chains, key identifiers, validity metadata.	Key protection, certificate validation, secure provisioning, authorization, audit, lifecycle controls.	Explicit Requirement	REQ_SEC_0016; REQ_SEC_0019; REQ-AUTO-00335; REQ-AUTO-00340; REQ-AUTO-00445; REQ_UDS-0038; REQ_UDS-0068; REQ_UDS-0070 (showing 8 of 69)
Backend/cloud/IT operational interface	Backend/cloud/IT systems <-> supplier/OEM/product lifecycle processes	Configuration, release data, software packages, logs, evidence, vulnerability records, security events.	Mutual authentication, transport encryption, authorization, audit logging, least privilege, vulnerability management.	Inferred from Requirements	REQ-AUTO-00001; REQ_SEC_0001; REQ_SEC_0002; REQ_SEC_0003; REQ_SEC_0022; REQ-AUTO-00009; REQ_SEC_0023; REQ-AUTO-00011 (showing 8 of 748)
Development, ALM, and evidence tooling interface	Engineering tools / ALM / CI / test systems -> evidence and release artifacts	Requirements, source references, architecture decisions, test reports, traceability matrices, release evidence.	Role-based access, artifact integrity, audit trail, change control, branch/release governance, credential protection.	Explicit Requirement	REQ-AUTO-00001; REQ_SEC_0002; REQ-AUTO-00009; REQ_SEC_0023; REQ_SEC_0004; REQ_SEC_0005; REQ_SEC_0041; REQ_SEC_0008 (showing 8 of 192)
Security operations and vulnerability reporting interface	Product/backend/security monitoring -> supplier and OEM security operations	Security events, logs, vulnerabilities, incident records, penetration-test findings, mitigations, risk treatment decisions.	Confidentiality, integrity, authenticated reporting, audit, incident workflow, retention controls.	Explicit Requirement	REQ_SEC_0002; REQ-AUTO-00009; REQ_SEC_0040; REQ_SEC_0041; REQ_SEC_0044; REQ_SEC_0045; REQ_SEC_0046; REQ_SEC_0032 (showing 8 of 25)
Application software to security services interface	Application software -> security services / crypto / diagnostic access control	Requests, messages, state variables, verification results, authorization decisions, security events.	API authorization, fail-closed error handling, input validation, logging, secure key isolation.	Inferred from Requirements	REQ-AUTO-00004; REQ-AUTO-00005; REQ-AUTO-00006; REQ_SEC_0003; REQ-AUTO-00011; REQ_SEC_0007; REQ_SEC_0008; REQ-AUTO-00021 (showing 8 of 909)
Hardware platform and key storage interface	Security services -> hardware platform / protected storage / HSM where available	Keys, certificates, boot measurements, software authenticity status, platform security state.	Key isolation, access control, secure boot, debug restrictions, tamper-aware handling, audit.	Inferred from Requirements	REQ_SEC_0003; REQ_SEC_0040; REQ_SEC_0025; REQ_SEC_0009; REQ_SEC_0010; REQ_SEC_0011; REQ_SEC_0026; REQ_SEC_0016 (showing 8 of 139)