TEST_PLAN_PACKET_TRANSFER_INTEGRITY.md

# Test Plan: Packet Transfer Integrity

## Secure Packet Transfer Integrity Stack v0.1

This is a conceptual and toy-test plan. It is not a production security validation plan.

## Test 1: Clean verified transfer

**Input:** Known payload, known source hash, valid authenticated session, destination hash match.  
**Expected state:** GREEN  
**Reason:** Payload, identity, session, boundary, and audit checks pass.

## Test 2: Hash mismatch

**Input:** Known payload altered before or after transfer.  
**Expected state:** RED  
**Reason:** Payload fidelity fails.

## Test 3: Packet loss / retransmission spike

**Input:** Transfer with packet loss or jitter, but final payload hash and session checks pass.  
**Expected state:** YELLOW or GREEN depending on threshold.  
**Reason:** Transport degradation occurred; final fidelity may still pass.

## Test 4: Replay attempt

**Input:** Replayed packet/session message from prior valid transfer.  
**Expected state:** RED if replay signal is detected or anti-replay protection fails.  
**Reason:** Boundary and handshake integrity fail.

## Test 5: Downgrade attempt

**Input:** Negotiated security is weakened or fallback is forced.  
**Expected state:** RED unless explicitly authorized and logged.  
**Reason:** Boundary-preserving transfer and handshake integrity are under hard-fault pressure.

## Test 6: Stale or invalid certificate

**Input:** Certificate expired, mismatched, revoked, unknown, or policy-invalid.  
**Expected state:** YELLOW or RED depending on policy.  
**Reason:** Authentication gate is degraded or failed.

## Test 7: Metadata concern

**Input:** Payload is protected, but routing, timing, endpoint, or metadata exposure exceeds the declared boundary.  
**Expected state:** YELLOW or RED depending on boundary sensitivity.  
**Reason:** R_boundary is degraded even if H_payload passes.

## Test 8: Audit-chain discontinuity

**Input:** Source/destination hashes exist, but transfer logs or provenance chain is missing, discontinuous, or unverifiable.  
**Expected state:** RED or downgraded claim state.  
**Reason:** Evidence boundary no longer supports full verification.

## Non-claim

Passing these toy tests does not establish production security, formal proof, cryptographic soundness, or adversarial robustness.