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+# Relay and Security Implementation Plan
+
+This document outlines the detailed implementation plan for the Relay and Security modules in the Network Library. It covers implementation details, dependencies, interfaces, and testing strategies with a particular focus on tier-aware functionality.
+
+## Table of Contents
+
+- [Introduction and Background](#introduction-and-background)
+- [Current State Assessment](#current-state-assessment)
+- [Relay Module Implementation](#relay-module-implementation)
+- [Security Module Implementation](#security-module-implementation)
+- [Integration with Existing Architecture](#integration-with-existing-architecture)
+- [Comprehensive Testing Strategy](#comprehensive-testing-strategy)
+- [Implementation Timeline](#implementation-timeline)
+
+## Introduction and Background
+
+The Network Library provides a hierarchical, resilient networking infrastructure. Two critical components are currently missing or incomplete:
+
+1. **Relay Module**: Enables indirect communication between nodes that cannot directly connect
+2. **Security Module**: Provides authentication, encryption, and access control
+
+This implementation plan addresses these gaps with a particular focus on tier awareness and integration with the existing architecture.
+
+## Current State Assessment
+
+### Relay Module
+
+**Current State**: Not implemented
+
+- Only has types.ts with interfaces and an index.ts that exports them
+- Missing core components like RelayConnectionManager, RelaySelector, etc.
+
+### Security Module
+
+**Current State**: Partially implemented
+
+- Has types.ts with security interfaces and an index.ts
+- Has a minimal SecurityPlugin implementation with placeholder methods
+- Missing comprehensive security framework
+
+## Relay Module Implementation
+
+### 1. Core Relay Infrastructure
+
+#### 1.1 relay-connection.ts
+
+**Purpose**: Manage individual relay connections between nodes
+**Key Responsibilities**:
+
+- Establish and maintain connection through relay nodes
+- Handle connection lifecycle (connect, disconnect, reconnect)
+- Implement heartbeat mechanism for connection health
+- Support connection timeouts and backoff strategies
+
+**Interface**:
+
+```typescript
+export class RelayConnection extends EventEmitter<RelayConnectionEvents> {
+  constructor(config: RelayConnectionConfig);
+  connect(): Promise<void>;
+  disconnect(): Promise<void>;
+  send(message: NetworkMessage): Promise<void>;
+  isConnected(): boolean;
+  getState(): ConnectionState;
+}
+```
+
+**Dependencies**:
+
+- NetworkNode
+- EventEmitter from @suaveplan/events
+- Transport layer for underlying communication
+
+#### 1.2 relay-message.ts
+
+**Purpose**: Handle relay message wrapping and processing
+**Key Responsibilities**:
+
+- Create RelayMessageEnvelope for wrapping original messages
+- Track relay path and hop count
+- Process incoming relay messages
+- Handle message security context across relay hops
+
+**Interface**:
+
+```typescript
+export class RelayMessage {
+  static createEnvelope(message: NetworkMessage, source: string, target: string, maxHops: number): RelayMessageEnvelope;
+  static updateEnvelope(envelope: RelayMessageEnvelope, nextHop: string): RelayMessageEnvelope;
+  static extractOriginalMessage(envelope: RelayMessageEnvelope): NetworkMessage;
+  static isRelayMessage(message: NetworkMessage): boolean;
+  static getRelayPath(envelope: RelayMessageEnvelope): string[];
+}
+```
+
+**Dependencies**:
+
+- NetworkMessage from types.ts
+- Security utilities for message integrity
+
+### 2. Relay Management Components
+
+#### 2.1 relay-connection-manager.ts
+
+**Purpose**: Manage multiple relay connections
+**Key Responsibilities**:
+
+- Track active relay connections
+- Route messages through appropriate relay paths
+- Handle connection state changes
+- Provide relay path selection based on tier hierarchy
+- Coordinate with TierManager for tier-aware relaying
+
+**Interface**:
+
+```typescript
+export class RelayConnectionManager extends EventEmitter<RelayManagerEvents> {
+  constructor(config: RelayManagerConfig);
+  initialize(node: NetworkNode): Promise<void>;
+  getConnection(peerId: string): RelayConnection | null;
+  createRelayPath(source: string, target: string, relayNodes: string[]): Promise<boolean>;
+  findRelayPath(source: string, target: string): string[] | null;
+  hasDirectPath(targetId: string): boolean;
+  relayMessage(message: NetworkMessage): Promise<boolean>;
+  getActiveRelayPaths(): RelayPath[];
+  getRelayStats(): RelayStats;
+}
+```
+
+**Dependencies**:
+
+- RelayConnection
+- NetworkNode
+- TierManager for tier-aware routing
+- MetricsManager for connection quality
+
+#### 2.2 relay-selector.ts
+
+**Purpose**: Select optimal relay nodes for connections
+**Key Responsibilities**:
+
+- Implement algorithms for selecting optimal relay nodes
+- Consider tier hierarchy in selection process
+- Support different selection strategies (latency, reliability, etc.)
+- Integrate with metrics system for performance-based selection
+
+**Interface**:
+
+```typescript
+export class RelaySelector {
+  constructor(config: RelaySelectorConfig);
+  initialize(node: NetworkNode, metricsManager: MetricsManager): Promise<void>;
+  selectRelayNodes(source: string, target: string, options?: RelaySelectionOptions): Promise<string[]>;
+  setSelectionStrategy(strategy: RelaySelectionStrategy): void;
+  getPreferredRelayNodes(): string[];
+  evaluateRelayCandidate(nodeId: string): Promise<number>; // Returns score
+}
+```
+
+**Dependencies**:
+
+- MetricsManager for node performance data
+- TierManager for tier-aware selection
+- NetworkNode for node information
+
+#### 2.3 relay-discovery.ts
+
+**Purpose**: Discover potential relay nodes in the network
+**Key Responsibilities**:
+
+- Implement mechanisms to discover potential relay nodes
+- Support different discovery methods (scan, registry, etc.)
+- Evaluate node capabilities for relay functionality
+- Periodically refresh relay node candidates
+
+**Interface**:
+
+```typescript
+export class RelayDiscovery extends EventEmitter<RelayDiscoveryEvents> {
+  constructor(config: RelayDiscoveryConfig);
+  initialize(node: NetworkNode): Promise<void>;
+  startDiscovery(options?: DiscoveryOptions): Promise<void>;
+  stopDiscovery(): void;
+  getDiscoveredRelays(): RelayNode[];
+  manuallyAddRelay(nodeId: string, capabilities?: NodeCapabilities): Promise<boolean>;
+  removeRelay(nodeId: string): boolean;
+}
+```
+
+**Dependencies**:
+
+- NetworkNode
+- MetricsManager for capability assessment
+- TierManager for tier structure
+
+### 3. Advanced Relay Features
+
+#### 3.1 relay-performance-monitor.ts
+
+**Purpose**: Monitor relay performance and quality
+**Key Responsibilities**:
+
+- Track performance metrics for relay paths
+- Identify poor-performing relay connections
+- Enable dynamic relay selection based on performance
+- Support tier-aware performance metrics
+
+**Interface**:
+
+```typescript
+export class RelayPerformanceMonitor extends EventEmitter<RelayPerformanceEvents> {
+  constructor(config: RelayPerformanceConfig);
+  initialize(relayManager: RelayConnectionManager, metricsManager: MetricsManager): Promise<void>;
+  startMonitoring(): void;
+  stopMonitoring(): void;
+  getPathPerformance(source: string, target: string): RelayPathPerformance;
+  getRelayNodePerformance(nodeId: string): RelayNodePerformance;
+  setPerformanceThresholds(thresholds: PerformanceThresholds): void;
+}
+```
+
+**Dependencies**:
+
+- RelayConnectionManager
+- MetricsManager
+- EventEmitter from @suaveplan/events
+
+#### 3.2 relay-strategies.ts
+
+**Purpose**: Implement different relay selection strategies
+**Key Responsibilities**:
+
+- Provide strategies for relay path selection
+- Implement tier-aware strategies
+- Support low-latency, high-reliability, and load-balanced approaches
+- Enable strategy switching at runtime
+
+**Interface**:
+
+```typescript
+export interface IRelayStrategy {
+  selectRelayPath(options: RelayStrategyOptions): Promise<string[]>;
+  getName(): string;
+  getPriority(): number;
+}
+
+export class LowestLatencyStrategy implements IRelayStrategy { /* implementation */ }
+export class HighestReliabilityStrategy implements IRelayStrategy { /* implementation */ }
+export class FewestHopsStrategy implements IRelayStrategy { /* implementation */ }
+export class TierOptimizedStrategy implements IRelayStrategy { /* implementation */ }
+export class LoadBalancedStrategy implements IRelayStrategy { /* implementation */ }
+```
+
+**Dependencies**:
+
+- MetricsManager for performance data
+- TierManager for tier structure
+
+#### 3.3 relay-security.ts
+
+**Purpose**: Provide security for relay connections
+**Key Responsibilities**:
+
+- Implement security verification for relay connections
+- Authenticate relay nodes
+- Validate relay message integrity
+- Prevent relay attacks
+- Maintain security context across tier boundaries
+
+**Interface**:
+
+```typescript
+export class RelaySecurityManager {
+  constructor(securityProvider: ISecurityProvider);
+  initialize(node: NetworkNode): Promise<void>;
+  verifyRelayNode(nodeId: string): Promise<boolean>;
+  authorizeRelayPath(path: string[]): Promise<boolean>;
+  secureRelayMessage(envelope: RelayMessageEnvelope): Promise<RelayMessageEnvelope>;
+  validateRelayMessage(envelope: RelayMessageEnvelope): Promise<boolean>;
+  getSecurityPolicy(): RelaySecurityPolicy;
+  setSecurityPolicy(policy: RelaySecurityPolicy): void;
+}
+```
+
+**Dependencies**:
+
+- SecurityManager from security module
+- RelayMessage for message handling
+- TierManager for tier-specific security
+
+## Security Module Implementation
+
+### 1. Core Security Framework
+
+#### 1.1 authentication-manager.ts
+
+**Purpose**: Handle authentication of nodes and users
+**Key Responsibilities**:
+
+- Implement node and user authentication
+- Support different authentication methods
+- Handle token generation and validation
+- Integrate with tier-based access control
+
+**Interface**:
+
+```typescript
+export class AuthenticationManager extends EventEmitter<AuthenticationEvents> {
+  constructor(config: AuthenticationConfig);
+  initialize(node: NetworkNode): Promise<void>;
+  authenticate(nodeId: string, credentials: AuthCredentials): Promise<AuthResult>;
+  validateToken(token: string): Promise<{ nodeId: string; permissions: string[] } | null>;
+  generateToken(nodeId: string, permissions: string[]): Promise<string>;
+  revokeToken(token: string): Promise<boolean>;
+  isAuthenticated(nodeId: string): Promise<boolean>;
+}
+```
+
+**Dependencies**:
+
+- NetworkNode
+- EventEmitter from @suaveplan/events
+- Optional external auth services
+
+#### 1.2 encryption-provider.ts
+
+**Purpose**: Provide message encryption and decryption
+**Key Responsibilities**:
+
+- Implement message encryption and decryption
+- Support various encryption algorithms
+- Handle key management
+- Ensure secure communication across tiers
+
+**Interface**:
+
+```typescript
+export class EncryptionProvider {
+  constructor(config: EncryptionConfig);
+  initialize(node: NetworkNode): Promise<void>;
+  encryptMessage(message: NetworkMessage, recipientId: string): Promise<NetworkMessage>;
+  decryptMessage(message: NetworkMessage, senderId: string): Promise<NetworkMessage>;
+  generateKey(options?: EncryptionOptions): Promise<CryptoKey>;
+  exportKey(key: CryptoKey): Promise<string>;
+  importKey(keyData: string, options?: EncryptionOptions): Promise<CryptoKey>;
+}
+```
+
+**Dependencies**:
+
+- Web Crypto API or Node.js crypto
+- KeyManager for key storage
+- TierManager for tier-specific encryption
+
+#### 1.3 access-control.ts
+
+**Purpose**: Control access to resources and operations
+**Key Responsibilities**:
+
+- Implement permission-based access control
+- Define and enforce access rules
+- Support role-based permissions
+- Integrate with tier-based access control
+
+**Interface**:
+
+```typescript
+export class AccessControlManager {
+  constructor(config: AccessControlConfig);
+  initialize(node: NetworkNode, authManager: AuthenticationManager): Promise<void>;
+  addRule(rule: AccessControlRule): void;
+  removeRule(ruleId: string): boolean;
+  checkPermission(nodeId: string, resource: string, action: string): Promise<boolean>;
+  getRules(): AccessControlRule[];
+  hasRole(nodeId: string, role: string): Promise<boolean>;
+  assignRole(nodeId: string, role: string): Promise<boolean>;
+  removeRole(nodeId: string, role: string): Promise<boolean>;
+}
+```
+
+**Dependencies**:
+
+- AuthenticationManager
+- TierManager for tier permissions
+- NetworkNode
+
+### 2. Enhanced Security Features
+
+#### 2.1 security-manager.ts
+
+**Purpose**: Coordinate all security aspects
+**Key Responsibilities**:
+
+- Central coordination of security components
+- Configure security policies
+- Track security events
+- Integrate security with network operations
+- Handle tier-specific security policies
+
+**Interface**:
+
+```typescript
+export class SecurityManager extends EventEmitter<SecurityEvents> {
+  constructor(config: SecurityConfig);
+  initialize(node: NetworkNode): Promise<void>;
+  getAuthenticationManager(): AuthenticationManager;
+  getEncryptionProvider(): EncryptionProvider;
+  getAccessControlManager(): AccessControlManager;
+  processTierSecurity(tierId: string, operation: string, data: any): Promise<boolean>;
+  setSecurityPolicy(policy: SecurityPolicy): void;
+  getSecurityPolicy(): SecurityPolicy;
+  handleSecurityEvent(event: SecurityEvent): void;
+}
+```
+
+**Dependencies**:
+
+- AuthenticationManager
+- EncryptionProvider
+- AccessControlManager
+- TierManager
+- NetworkNode
+
+#### 2.2 message-integrity.ts
+
+**Purpose**: Ensure message integrity and authenticity
+**Key Responsibilities**:
+
+- Implement message signing
+- Verify message signatures
+- Detect message tampering
+- Ensure end-to-end message integrity
+- Handle cross-tier message integrity
+
+**Interface**:
+
+```typescript
+export class MessageIntegrityManager {
+  constructor(config: MessageIntegrityConfig);
+  initialize(node: NetworkNode): Promise<void>;
+  signMessage(message: NetworkMessage): Promise<NetworkMessage>;
+  verifySignature(message: NetworkMessage, senderId: string): Promise<boolean>;
+  addIntegrityCheck(message: NetworkMessage): Promise<NetworkMessage>;
+  validateIntegrity(message: NetworkMessage): Promise<boolean>;
+  setSigningAlgorithm(algorithm: string, options?: any): void;
+}
+```
+
+**Dependencies**:
+
+- Web Crypto API or Node.js crypto
+- SecurityManager
+- NetworkNode
+
+#### 2.3 security-middleware.ts
+
+**Purpose**: Process messages through security pipeline
+**Key Responsibilities**:
+
+- Create middleware for automatic message security
+- Apply appropriate security measures based on policy
+- Handle incoming/outgoing message processing
+- Integrate with middleware system
+- Support tier-specific middleware processing
+
+**Interface**:
+
+```typescript
+export class SecurityMiddleware implements IMiddleware {
+  constructor(securityManager: SecurityManager, config?: SecurityMiddlewareConfig);
+  processOutgoing(message: NetworkMessage): Promise<NetworkMessage>;
+  processIncoming(message: NetworkMessage): Promise<NetworkMessage>;
+  getPriority(): number;
+  getName(): string;
+  initialize(node: NetworkNode): Promise<void>;
+}
+```
+
+**Dependencies**:
+
+- SecurityManager
+- MiddlewareManager from middleware module
+- NetworkNode
+- TierManager for tier-specific processing
+
+### 3. Plugin System Integration
+
+#### 3.1 security-plugin.ts (Enhanced)
+
+**Purpose**: Provide security capabilities as a plugin
+**Key Responsibilities**:
+
+- Complete implementation of the security plugin
+- Support complex security scenarios
+- Integrate with plugin system
+- Handle tier-specific security
+
+**Interface**:
+
+```typescript
+export class SecurityPlugin implements ISecurityPlugin {
+  readonly id: string = 'security';
+  constructor(options: SecurityPluginOptions);
+  onRegister(node: NetworkNode): void;
+  onUnregister(node: NetworkNode): void;
+  validateMessage(message: NetworkMessage): boolean;
+  encryptMessage(message: NetworkMessage): Promise<NetworkMessage>;
+  decryptMessage(message: NetworkMessage): Promise<NetworkMessage>;
+  signMessage(message: NetworkMessage): Promise<NetworkMessage>;
+  verifySignature(message: NetworkMessage): Promise<boolean>;
+  handleTierSecurityContext(tierChange: TierChangeEvent): Promise<void>;
+}
+```
+
+**Dependencies**:
+
+- SecurityManager
+- PluginManager from plugins module
+- TierManager
+- NetworkNode
+
+#### 3.2 plugin-security-verifier.ts
+
+**Purpose**: Verify security of plugins
+**Key Responsibilities**:
+
+- Implement security verification for plugins
+- Validate plugin integrity
+- Enforce plugin permissions
+- Protect against malicious plugins
+- Handle tier-specific plugin security
+
+**Interface**:
+
+```typescript
+export class PluginSecurityVerifier {
+  constructor(securityManager: SecurityManager);
+  initialize(pluginManager: PluginManager): Promise<void>;
+  verifyPlugin(pluginId: string, pluginData: any): Promise<boolean>;
+  authorizePluginOperation(pluginId: string, operation: string, context?: any): Promise<boolean>;
+  monitorPluginActivity(pluginId: string): void;
+  setPluginSecurityPolicy(policy: PluginSecurityPolicy): void;
+  getPluginSecurityPolicy(): PluginSecurityPolicy;
+}
+```
+
+**Dependencies**:
+
+- SecurityManager
+- PluginManager from plugins module
+- TierManager for tier-specific verification
+
+## Integration with Existing Architecture
+
+### 1. NetworkNode Integration
+
+**Integration Points**:
+
+- Add relay capabilities to NetworkNode
+- Integrate security features into node operations
+- Update node configuration to support new components
+- Support tier-aware relay and security
+
+**Implementation Details**:
+
+```typescript
+// Extend NetworkNode with relay capabilities
+export interface NetworkNodeConfig {
+  // Existing properties
+  relayConfig?: RelayConfig;
+  securityConfig?: SecurityConfig;
+}
+
+// Add to NetworkNode class
+class NetworkNode {
+  // Existing properties
+  private _relayManager: RelayConnectionManager;
+  private _securityManager: SecurityManager;
+  
+  // New methods
+  getRelayManager(): RelayConnectionManager;
+  getSecurityManager(): SecurityManager;
+  sendViaRelay(targetId: string, message: any): Promise<void>;
+  createSecureChannel(targetId: string): Promise<SecureChannel>;
+}
+```
+
+### 2. Router Integration
+
+**Integration Points**:
+
+- Integrate relay with router for indirect connections
+- Support security-aware routing decisions
+- Add relay path consideration to routing strategies
+
+**Implementation Details**:
+
+```typescript
+// Update Router interface
+interface RouterConfig {
+  // Existing properties
+  useRelayForUnreachable?: boolean;
+  enforceMessageSecurity?: boolean;
+}
+
+// Add to Router class
+class Router {
+  // Existing properties
+  private _relayManager: RelayConnectionManager;
+  private _securityManager: SecurityManager;
+  
+  // New methods
+  setRelayManager(relayManager: RelayConnectionManager): void;
+  setSecurityManager(securityManager: SecurityManager): void;
+  findRouteThroughRelay(targetId: string): Promise<string[]>;
+}
+```
+
+### 3. Tier Integration
+
+**Integration Points**:
+
+- Integrate relay and security with tier management
+- Support tier-specific security policies
+- Enable tier-aware relay path selection
+- Handle relay during tier reorganization
+
+**Implementation Details**:
+
+```typescript
+// Add tier-aware relay functionality
+interface TierManagerEvents {
+  // Existing events
+  tierReorganization: (data: { tiers: Map<string, TierInfo> }) => void;
+  relayPathUpdate: (data: { affected: string[] }) => void;
+}
+
+// Update TierManager
+class TierManager {
+  // Existing properties
+  
+  // New methods
+  getRelayNodesForTier(tierId: string): string[];
+  getTierSecurityPolicy(tierId: string): SecurityPolicy;
+  findOptimalRelayPath(sourceTier: string, targetTier: string): string[];
+}
+```
+
+## Comprehensive Testing Strategy
+
+### 1. Unit Testing
+
+**Test Coverage**:
+
+- 100% line, branch, and function coverage
+- Individual component testing in isolation
+- Comprehensive mocking of dependencies
+
+**Example Test Structure**:
+
+```typescript
+// relay-connection.spec.ts
+describe('RelayConnection', () => {
+  test('should establish connection through relay node', async () => {...});
+  test('should handle relay node disconnection gracefully', async () => {...});
+  test('should implement heartbeat mechanism correctly', async () => {...});
+  test('should respect connection timeout configuration', async () => {...});
+});
+
+// encryption-provider.spec.ts
+describe('EncryptionProvider', () => {
+  test('should encrypt and decrypt messages correctly', async () => {...});
+  test('should handle key rotation properly', async () => {...});
+  test('should detect tampered messages', async () => {...});
+  test('should respect encryption algorithm preferences', async () => {...});
+});
+```
+
+### 2. Integration Testing
+
+**Test Scenarios**:
+
+- Cross-component interactions
+- Subsystem behavior verification
+- Realistic network environment simulation
+
+**Example Integration Tests**:
+
+```typescript
+// relay-router-integration.spec.ts
+describe('Relay and Router Integration', () => {
+  test('should route messages through relay when direct connection fails', async () => {...});
+  test('should select optimal relay path based on metrics', async () => {...});
+  test('should failover to alternative relay path when primary fails', async () => {...});
+});
+
+// security-middleware-integration.spec.ts
+describe('Security and Middleware Integration', () => {
+  test('should apply security processing in middleware pipeline', async () => {...});
+  test('should handle encrypted messages in middleware chain', async () => {...});
+  test('should reject unauthorized messages via middleware', async () => {...});
+});
+```
+
+### 3. Tier-Aware Testing
+
+**Tier-Specific Test Scenarios**:
+
+- Tier-crossing message flows
+- Tier-level broadcasting
+- Optimal path selection across tiers
+- Tier boundary security verification
+
+**Test Infrastructure**:
+
+- Hierarchical network simulator
+- Tier-aware test metrics
+- Tier-based failure injection
+
+**Example Tier-Aware Tests**:
+
+```typescript
+// tier-aware-relay.spec.ts
+describe('Tier-Aware Relay Functionality', () => {
+  test('should relay messages up the tier hierarchy to common ancestor and down to target', async () => {...});
+  test('should broadcast messages to all nodes across all tiers', async () => {...});
+  test('should select optimal relay path considering tier hierarchy', async () => {...});
+  test('should handle relay node failures at higher tiers gracefully', async () => {...});
+});
+
+// tier-security-boundary.spec.ts
+describe('Tier Security Boundaries', () => {
+  test('should enforce tier-specific access controls', async () => {...});
+  test('should maintain security context across tier boundaries', async () => {...});
+  test('should validate credentials at tier crossing points', async () => {...});
+  test('should handle credential delegation for cross-tier operations', async () => {...});
+});
+```
+
+### 4. Performance and Resilience Testing
+
+**Performance Scenarios**:
+
+- Throughput measurement under various conditions
+- Latency impact of relay and security features
+- Resource utilization monitoring
+- Scalability with increasing network size and message volume
+
+**Resilience Scenarios**:
+
+- Chaos testing with random failures
+- Network partition scenarios
+- Security attack simulations
+- Resource constraint testing
+
+**Example Performance Tests**:
+
+```typescript
+// relay-performance.spec.ts
+describe('Relay Performance', () => {
+  benchmarkTest('should handle >1000 messages/sec through single relay', async () => {...});
+  benchmarkTest('should maintain <50ms added latency per relay hop', async () => {...});
+  benchmarkTest('should scale linearly with number of connections', async () => {...});
+});
+
+// tier-resilience.spec.ts
+describe('Tier Resilience', () => {
+  test('should maintain connectivity when entire tier becomes unavailable', async () => {...});
+  test('should reorganize relay paths after tier changes', async () => {...});
+  test('should recover relay functionality after network partition heals', async () => {...});
+  test('should maintain security integrity during network instability', async () => {...});
+});
+```
+
+## Implementation Timeline
+
+### Phase 1: Core Infrastructure (Week 1-2)
+
+- Implement relay-connection.ts and relay-message.ts
+- Implement authentication-manager.ts and encryption-provider.ts
+- Create unit tests for all core components
+- Integrate with existing types and interfaces
+
+### Phase 2: Management Components (Week 2-3)
+
+- Implement relay-connection-manager.ts and relay-selector.ts
+- Implement access-control.ts and security-manager.ts
+- Create integration tests for management components
+- Begin tier-aware testing
+
+### Phase 3: Advanced Features (Week 3-4)
+
+- Implement relay-performance-monitor.ts and relay-strategies.ts
+- Implement message-integrity.ts and security-middleware.ts
+- Enhance security-plugin.ts implementation
+- Expand test coverage to advanced features
+
+### Phase 4: Integration and Testing (Week 4-5)
+
+- Complete integration with NetworkNode, Router, and TierManager
+- Implement comprehensive tier-aware tests
+- Conduct performance and resilience testing
+- Address any issues discovered during testing
+
+### Phase 5: Documentation and Examples (Week 5)
+
+- Update module READMEs with implementation details
+- Create API documentation for all components
+- Develop example applications demonstrating relay and security features
+- Create tier-aware usage examples
+
+## Conclusion
+
+This implementation plan provides a comprehensive roadmap for developing the Relay and Security modules with tier awareness as a core consideration. Following this plan will ensure these modules integrate seamlessly with the existing network library architecture while providing the resilience, performance, and security required for hierarchical network applications.