Calendar Icon White
August 7, 2023
Clock Icon
 min read

What is CASB Security? Guide on Cloud Access Security Brokers in 2024

Cloud Access Security Broker (CASB) solution is a security tool that secures cloud-based resources and protects data between an organization’s infrastructure and cloud applications.

What is CASB Security? Guide on Cloud Access Security Brokers in 2024
Calendar Icon White
August 7, 2023
Clock Icon
 min read

What is CASB Security? Guide on Cloud Access Security Brokers in 2024

Cloud Access Security Broker (CASB) solution is a security tool that secures cloud-based resources and protects data between an organization’s infrastructure and cloud applications.


  • Cloud Access Security Broker (CASB) solution is a security tool that secures cloud-based resources and protects data between an organization’s infrastructure and cloud applications.
  • It provides visibility into cloud usage, enforces security policies, and safeguards sensitive data from threats.
  • CASBs use API-based and Proxy-based deployment models. API-based CASB integrates with cloud service providers' APIs to monitor data and activities. Proxy-based CASB acts as an intermediary between users and cloud services, inspecting traffic in real-time.
  • Key features of CASB include - cloud application visibility, data loss prevention, identity safeguarding, threat detection, encryption and tokenization to protect sensitive data and compliance monitoring.
  • To choose the right CASB, identify and categorize shadow IT cloud services, measure risks, ensure the safety of enterprise data stored within the cloud, identify possible misuse of the organization’s cloud services, and introduce multiple cloud service functionality and data access levels. 

Back in 2006, Amazon launched Amazon Web Service - a service that allowed Amazon to rent computing resources to clients globally. 17 years later, Amazon enjoys more than 1 million active customers across 190 countries - a massive feat hard to replicate. 

However, in reality, not everything’s good in paradise. The company faces cyber threats every odd second, and despite implementing strong security protocols, a cyber-security firm identified over 6.5 terabytes of exposed information in May of 2022. 

This raises eyebrows and makes us think, is our data really secure? More significantly, how safe are our businesses’ valuable digital assets? 

The answers lie in Cloud Access Security Broker (CASB).

What is CASB Security?

A Cloud Access Security Broker (CASB) is a specialized security solution designed to secure cloud-based resources. It safeguards sensitive data as it moves between an organization’s on-premise IT infrastructure and various cloud applications, providing an extra layer of security and ensuring compliance with industry standards.

In simpler terms, a CASB serves as an intermediary between users and cloud services. It not only monitors all activity but also enforces your organization's security policies. Think of CASB as a gatekeeper, allowing safe and compliant cloud access while denying any potentially risky activities or transactions.

CASBs are crucial in the current era of increasing cloud adoption and growing cybersecurity threats. They address the unique security challenges that arise from the use of cloud services, including the risk of data leakage, unauthorized access, and non-compliance with regulations.

Key Use Cases of CASB Security

  • Cloud Data Access Control
  • Shadow IT Discovery
  • Enforces Security Policies
  • Data Loss Prevention
  • Cloud Application Visibility
  • Identity Protection
  • Advanced Threat Detection and Protection
  • Encryption and Tokenization
  • Compliance Monitoring

1. Cloud Data Access Control

A CASB helps manage various aspects of cloud security such as identifying unauthorized cloud services (also known as Shadow IT), flagging potential risks associated with various cloud applications, and tracking user behavior to detect anomalies. For instance, if an employee starts downloading excessive amounts of data from a cloud service, the CASB could detect this unusual behavior and alert the administrators.

2. Shadow IT Discovery

CASB aids in identifying unsanctioned cloud applications used by employees (Shadow IT), allowing IT administrators to assess associated risks and manage cloud application usage appropriately.

3. Enforces Security Policies

One of the fundamental roles of a CASB is allowing administrators to enforce granular security policies across different cloud applications. This capability ensures that your organization's use of cloud services aligns with your internal security policies and regulatory requirements. For example, you can set policies to restrict access to sensitive data based on user roles, locations, or devices.

4. Data Loss Prevention

Cybersecurity threats are escalating, with more than 236.1 million attacks hitting servers globally each year. A CASB protects sensitive data from these threats in the organization's cloud environment, thereby helping to mitigate risks associated with data breaches and cyber-attacks. This protection includes features like encryption, tokenization, and data loss prevention (DLP).

By providing visibility into cloud application usage, enforcing security policies, and protecting sensitive data, a CASB plays an invaluable role in an organization's overall cybersecurity framework.

SaaS integrations of Strac CASB

A Cloud Access Security Broker (CASB) is integral to any cloud security strategy due to its extensive capabilities. It facilitates visibility, data protection, threat detection, and policy enforcement, enabling organizations to confidently embrace cloud services while maintaining control over their data and ensuring compliance with industry standards. Let's delve into some of these capabilities in detail:

5. Cloud Application Visibility

A CASB grants organizations real-time visibility into cloud applications. It helps distinguish between sanctioned and unsanctioned (Shadow IT) cloud applications, giving IT administrators insights into cloud service usage and potential security risks.

6. Identity Protection

CASB integrates with identity providers to enforce robust authentication methods, such as Multi-Factor Authentication (MFA) and Single Sign-On (SSO). This safeguard ensures that only authorized users can access cloud applications and data.

7. Advanced Threat Detection and Protection

CASB deploys sophisticated threat detection mechanisms to identify and neutralize various cloud-based threats, including malware, ransomware, phishing attempts, and other suspicious user activities. It alerts in real-time and responds to potential security breaches. For instance, if a user logs into Salesforce from Russia five minutes after logging into Office 365 from California, the CASB will detect this anomaly through a combination of detailed activity logs and User and Entity Behavior Analytics (UEBA).

8. Encryption and Tokenization

CASB incorporates encryption and tokenization capabilities to secure sensitive data at rest and in transit. Encryption ensures that intercepted data remains unreadable to unauthorized individuals. Tokenization replaces sensitive data with non-sensitive tokens, further enhancing data security. For example, Strac as a tokenization provider offers UI components that block the parent page from accessing sensitive data. Strac then tokenizes this data and returns the tokens to the UI app.

9. Compliance Monitoring

CASB supports organizations in meeting regulatory compliance requirements, ensuring that data stored and processed in the cloud aligns with industry-specific regulations such as GDPR, HIPAA, and CCPA. Many CASB solutions offer compliance reporting and auditing features, assisting organizations in adhering to these regulations.

Strac Complaince Certification

By integrating these key capabilities, a CASB provides a holistic and flexible approach to cloud security, shielding organizations from emerging threats and mitigating risks associated with cloud-based services.

How Does Cloud Access Security Brokers Work?

CASB solutions operates through two primary deployment models: API-based and Proxy-based. Here's how you can implement each model,

API-based CASB

In the API-based model, the CASB integrates directly with the cloud service providers’ APIs, enabling it to monitor and control data and activities within the cloud applications. This model provides more visibility without rerouting traffic but requires cloud providers to expose their APIs for integration.

Here is how you can implement API-based CASB:

Working of API based CASB solutions

Step 1: Discovery and Inventory

The CASB discovers and inventories all cloud applications used across your organization. It differentiates between sanctioned and unsanctioned applications, providing administrators with a comprehensive view of all cloud services in use. 

Step 2: API Integration and Data Collection

The CASB integrates with the cloud service providers’ APIs. This integration allows it to access metadata, user activity logs, and other relevant information from cloud applications. It also collects data on user actions, file activities, login attempts, and security events within the cloud environment.

Step 3: Continuous Monitoring and Visibility

The CASB continually monitors user activities and real-time data within the cloud applications. This provides IT administrators with visibility into who is accessing what data, from where, and on what device.

Step 4: Data Loss Prevention and Policy Enforcement

The CASB can enforce on sensitive data within cloud applications. It also enforces encryption, access controls, and other security practices based on predefined rules and compliance requirements.

Redaction of sensitive data in Zendesk Tickets

Step 5: Threat Detection and Response

CASB employs advanced threat detection mechanisms to identify and block cyber threats aimed at cloud applications. It can enforce encryption, access controls, and other security policies based on pre-defined rules and compliance requirements.

Step 6: Reporting and Compliance

API-based CASB generates comprehensive reports on cloud application usage, security events, policy violations, and compliance status. These reports are essential for compliance audits and improving cloud security practices. 

Proxy-based CASB

In the proxy-based CASB deployment model, CASB acts as an intermediary proxy between users and cloud services. All traffic passes through the CASB, enabling real-time inspection, data protection, and policy enforcement. The Proxy-based approach introduces some latency but provides robust security features. Here is how it works:

Step 1: Traffic Redirection

All user traffic to and from cloud applications is redirected through the CASB proxy. Users must authenticate with the CASB before accessing cloud resources, ensuring all cloud activities are routed through the security gateway. 

Step 2: Inspection and Policy Enforcement

CASB inspects all traffic passing through the proxy, scanning for potential threats and policy violations. It enforces security policies like data encryption, access controls, and DLP-based predefined rules. 

Strac CASB: Block and Alert when a sensitive file is shared over the internet

Step 3: Malware and Threat Detection

Proxy-based CASBs employ real-time malware and threat detection mechanisms to identify and block malicious content before it reaches the cloud applications or the end users. 

Step 4: Data Protection and Encryption

CASB can encrypt data before it leaves the organization’s network, ensuring that sensitive information remains protected throughout its journey to the cloud. 

Step 5: Access Control and Authentication

CASB enforces strong authentication mechanisms, such as multi-factor authentication (MFA) and single sign-on (SSO), to ensure that only authorized users can access cloud resources. 

Step 6: Monitoring and Reporting

The CASB continuously monitors cloud activities, generating logs and reports on user behavior, policy compliance, security incidents, and threat intelligence.

CASB’s ability to provide comprehensive visibility, control, data protection, and threat detection makes it a crucial component of modern cloud security strategies. 

Also read: How Strac protects sensitive data with tokenization

Essential CASB Features to Look For in 2024

Choosing the right CASB can be confusing as most vendors promise one of a few features without differentiation. Here are some key points to identify the right CASB solution provider for your business.

Check out our list of Top 10 CASB Solutions

  • Identify and categorize Shadow IT cloud services employed and determine if they pose a risk.
  • Measure risks and choose cloud services that meet internal and industry security and compliance standards. 
  • Ensure the safety of enterprise data stored within the cloud by preventing specific types of sensitive data from getting uploaded in conjunction with tokenizing and encrypting data. 
  • Identify possible misuse of the organization’s cloud services. This includes unauthorized activities by insiders and third parties, which may compromise user accounts. 
  • Introduce multiple levels of cloud service functionality and data access supported user’s devices, operating systems, and placement. 

How Does Strac CASB Help?

Despite CASBs’ capabilities and familiarity with approaches and techniques used to protect data in on-premise setups ring bell, CASBs, however, are a lot different. 

CASBs are often misunderstood. For instance, when CASBs first appeared, it was considered a cloud surveillance solution. However, modern-day CASBs like Strac offer a wide range of capabilities across core compliance, data security, transparency, and threat protection. 

So what else does Strac help us achieve? 

Strac as a comprehensive data loss prevention (DLP) solution helps companies of all sizes:

  1. Redaction of Sensitive Data: Strac can redact sensitive data and documents across all SaaS platforms (including the likes of Gmail, Slack, Zendesk, and Salesforce) and cloud platforms like AWS and Azure.
  2. Instant Detection of Sensitive Data Subjects: Strac has the capability to instantly detect Personal Identifiable Information (PII), Personal Health Information (PHI), and other sensitive data subjects that are on the brink of a breach. In such instances, Strac triggers an alarm, notifying customers to take swift action.
  3. Custom Remediation: Block or Alert or Encrypt sensitive files when shared by users on their Mac or Windows endpoints.

In conclusion, the power of CASBs, particularly Strac, extends far beyond simple surveillance. Its proactive approach to data loss prevention, compliance, and threat detection make it an indispensable tool for robust cloud security strategies.

Founder, Strac. ex-Amazon Payments Infrastructure (Widget, API, Security) Builder for 11 years.

Latest articles

Browse all