# Sunrise Model Service
## Architecture, Security, and Data Protection Overview

### 1. Introduction
This document provides an overview of the architecture, security controls, tenant isolation mechanisms, data processing principles, and data protection measures implemented within the Sunrise Model Service (Model as a Service) platform.

The information is intended to address requirements related to:
*   Architectural diagrams and deployment concepts
*   Tenant isolation and separation
*   Encryption controls
*   Data processing and transaction handling
*   Network segmentation
*   Data residency and processing location requirements

### 2. High-Level Sunrise Model Service Architecture
The Sunrise Model Service platform provides secure access to AI models through API-based services hosted within Switzerland.

**Logical Architecture**

    Customer Applications
            │
            ▼
        AI Gateway
    (Authentication, Authorization,
    Tenant Isolation, Audit, Policies)
            ├── Governance & Audit Layer
            ├── Guardrails & Security Controls
            │
            ▼
        AI Model Services
    (KServe / Model Serving)
            ├── Model Routing Layer
            └── AI Model Services
            │
            ▼
    Access to AI Models
    Model Runtime Infrastructure
            │
            ▼
    Swiss-Based Infrastructure & Storage

**Deployment Model**
The platform supports:
*   **Shared Environment**
    *   Multiple customers consume centrally managed model services.
    *   Logical tenant isolation is enforced at all layers.
    *   Customer data remains isolated from other tenants.
*   **Dedicated Environment (Optional)**
    *   Dedicated infrastructure and model-serving resources can be provisioned for customers requiring enhanced isolation.
    *   Dedicated environments provide additional segregation of workloads, compute resources, and operational controls.

### 3. Tenant Isolation and Separation Concept
The Sunrise Model Service platform uses the **LiteLLM AI Gateway** as the central access and policy enforcement layer for all model interactions. The gateway provides logical tenant isolation, access control, routing, governance, and monitoring capabilities across the platform.

**Tenant Isolation Through LiteLLM AI Gateway**
*   **Dedicated Customer Authentication**
    *   Each customer is assigned dedicated API credentials.
    *   All requests are authenticated by the LiteLLM AI Gateway before access to any model service is granted.
    *   Customer-specific access policies ensure that only authorized models and services are accessible.
*   **Request and Session Isolation**
    *   The LiteLLM AI Gateway processes requests on behalf of authenticated tenants and enforces separation between customer workloads.
    *   Requests are handled independently and are not shared across customers.
    *   Customer prompts and model responses remain isolated within the context of the originating tenant.
*   **Policy-Based Access Control**
    *   The gateway enforces tenant-specific policies, including:
        *   Authentication and authorization
        *   Model access restrictions
        *   Usage limits and quotas
        *   Audit and monitoring controls
    *   Customers cannot access another customer's models, configurations, requests, or responses.
*   **Data Isolation**
    *   Customer data submitted for inference remains logically separated from other tenants.
    *   The platform does not expose customer prompts, responses, or usage data across tenant boundaries.
    *   Model inference processing is performed within the security context of the authenticated tenant.

### 4. Encryption

**Encryption in Transit**
All communications with the Sunrise Model Service platform are protected using industry-standard TLS encryption.
This includes:
*   Customer-to-LiteLLM AI Gateway communication
*   LiteLLM AI Gateway-to-model service communication
*   Internal service-to-service communication
*   Administrative access channels
These controls ensure that data transmitted across networks is protected against unauthorized interception and tampering.

**Data Storage Protection**
The Sunrise Model Service platform minimizes the storage of customer data and applies access-control mechanisms to protect operational data stored within platform databases.
Where platform data is stored:
*   Access is restricted to authorized services and personnel only.
*   Database access requires authenticated credentials.
*   Access permissions are granted according to the principle of least privilege.
*   Administrative access is controlled and audited.
*   Access to stored data is logged and monitored.

**Credential Management**
Database credentials and service credentials are managed through controlled operational processes and are accessible only to authorized personnel and platform components requiring access for service operation.

**Data Protection Controls**
Customer data submitted for model inference is processed within the Sunrise Model Service platform and protected through:
*   Strong authentication and authorization controls
*   Tenant isolation enforced by the LiteLLM AI Gateway
*   Network segmentation
*   Controlled administrative access
*   Security monitoring and audit logging
These controls help ensure that access to customer data is restricted to authorized users, services, and operational processes.

### 5. Network Segmentation
The Sunrise Model Service platform implements layered network segmentation to isolate customer access, model-serving infrastructure, and management services.

**Sunrise Model Service Architecture**

**Segmented Architecture**
*   **Access Layer**
    *   Customer traffic terminates at the LiteLLM AI Gateway.
    *   The gateway serves as the single controlled entry point to the Sunrise Model Service platform.
*   **Application Layer**
    *   LiteLLM AI Gateway
    *   Governance services
    *   Authentication and authorization services
    *   Monitoring and audit services
*   **Model Serving Layer**
    *   OpenShift AI Model Services
    *   KServe model endpoints
    *   Model runtimes (vLLM, TGI, Triton, ONNX Runtime)
*   **Infrastructure Layer**
    *   GPU and compute resources
    *   Storage services
    *   Platform infrastructure

Communication between layers is restricted through network policies, firewall controls, and least-privilege access principles.

### 6. Cyber Security Controls
The Sunrise Model Service platform applies multiple layers of security controls to protect customer data and AI workloads.

**Security Architecture**
The LiteLLM AI Gateway acts as the primary security enforcement point for model access and tenant separation.
Security functions include:
*   Customer authentication
*   Authorization enforcement
*   Tenant isolation via teams
*   API key management
*   Request routing
*   Usage control and quotas
*   Audit logging
*   Security monitoring

**Additional Security Controls**
*   Role-Based Access Control (RBAC)
*   Encryption in transit and at rest
*   Network segmentation
*   Vulnerability management
*   Security patch management
*   Continuous monitoring and alerting
*   Governance and compliance controls

**Administrative Security**
Administrative access is restricted according to the principle of least privilege and is limited to authorized personnel. All privileged activities are logged and monitored.

### 7. Data Residency and Processing Location

**Processing Only in Switzerland**
The Sunrise Model Service platform is operated in accordance with the requirement that customer data is processed exclusively within Switzerland.

**Commitment**
The provider, including any approved subcontractors involved in service delivery, processes customer data only within Switzerland.
This includes:
*   Compute resources
*   Storage systems
*   Model-serving infrastructure
*   Operational processing activities

**Access Restrictions**
*   Automated access from outside Switzerland is prohibited.
*   Manual access from outside Switzerland is prohibited.
*   Exceptional emergency situations are governed by established security and compliance procedures and are subject to strict controls and approval processes.

**Data Transfers**
Customer data is not routinely transferred outside Switzerland for processing, storage, or operational purposes.

### 8. Summary
The Sunrise Model Service platform provides:
*   Secure AI model access through managed APIs
*   Strong tenant isolation and customer separation
*   Encryption in transit and at rest
*   Network segmentation and layered security controls
*   Auditability and governance capabilities
*   Processing and storage of customer data exclusively within Switzerland

These controls support regulatory, security, and data protection requirements for organizations operating in regulated environments, including the financial sector.

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