Shared responsibility model in Cybersecurity - Full Explanation

Introduction

When using cloud services, it can be unclear who is responsible for protecting data and systems. This confusion can lead to security gaps and risks. The shared responsibility model helps clarify what the cloud provider handles and what the user must manage.

Explanation

Cloud provider responsibilities

The cloud provider manages the security of the cloud infrastructure. This includes physical data centers, hardware, networking, and foundational services. They ensure the environment is safe from physical and technical threats.

Cloud providers secure the infrastructure and foundational services.

Customer responsibilities

Customers are responsible for securing their data, applications, and access controls within the cloud. This means managing user permissions, data encryption, and application security. The exact duties depend on the cloud service type used.

Customers secure their data, applications, and user access.

Differences by service type

The shared responsibility changes based on the cloud service model: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), or Software as a Service (SaaS). For example, in IaaS, customers manage more security tasks than in SaaS.

Responsibility shifts depending on the cloud service model.

Importance of clear boundaries

Clear understanding of who handles what prevents security gaps. If customers assume the provider handles everything, they may neglect securing their data. Likewise, providers rely on customers to protect their own assets.

Clear boundaries prevent security gaps and risks.

Real World Analogy

Imagine renting an apartment in a building. The landlord secures the building structure and common areas, while you are responsible for locking your apartment door and keeping your belongings safe. Both roles are needed for overall security.

Cloud provider responsibilities → Landlord securing the building and common areas

Customer responsibilities → Tenant locking their apartment and protecting belongings

Differences by service type → Different types of apartments with varying landlord and tenant duties

Importance of clear boundaries → Knowing exactly what the landlord and tenant must each do to keep the building safe

Diagram

Diagram

┌───────────────────────────────┐
│       Shared Responsibility    │
├───────────────┬───────────────┤
│ Cloud Provider│   Customer    │
├───────────────┼───────────────┤
│ Physical data │ Data & apps   │
│ centers      │ User access   │
│ Hardware     │ Configuration │
│ Network      │ Security      │
└───────────────┴───────────────┘

Diagram showing the split of security duties between cloud provider and customer.

Key Facts

Shared responsibility model → A framework defining security duties split between cloud providers and customers.

Cloud provider responsibilities → Security of the cloud infrastructure like hardware, network, and physical facilities.

Customer responsibilities → Security of data, applications, and user access within the cloud environment.

IaaS → Cloud service where customers manage more security tasks compared to SaaS.

SaaS → Cloud service where providers manage most security, customers focus on data and access.

Common Confusions

Believing the cloud provider secures everything including customer data.

Believing the cloud provider secures everything including customer data. Cloud providers secure infrastructure only; customers must secure their own data and applications.

Assuming all cloud service models have the same security responsibilities.

Assuming all cloud service models have the same security responsibilities. Security duties vary by service type; IaaS requires more customer management than SaaS.

Summary

The shared responsibility model divides security tasks between cloud providers and customers to avoid gaps.

Cloud providers secure the infrastructure, while customers protect their data and applications.

Security duties change depending on the cloud service type used.