ISO 27001 Authentication Information (Annex A 5.17)

Introduction

Authentication Information is a critical control under ISO 27001:2022 Annex A 5.17, ensuring that authentication mechanisms such as passwords, multi-factor authentication (MFA), and credential systems are securely implemented and managed. As authentication is the primary gateway to systems and data, weak authentication practices can lead to unauthorized access, identity compromise, and significant security breaches.

This control ensures that organizations implement secure authentication mechanisms, enforce strong password policies, and monitor authentication activities, thereby protecting user identities and organizational assets.

What This Control Is About (Basic Information)

Comply Agent shows the following core attributes:

• Title: Authentication information
• Control ID: UC-AC-017
• Category: Access Control
• Subcategory: Secure Configuration and Management
• Version: v1.0

The control requires organizations to implement secure password policies, credential storage mechanisms, and authentication processes to protect systems and identities.

Objective:
To protect organizational assets and user identities by enforcing secure authentication policies and mechanisms.

This includes:

• Implementing strong authentication mechanisms
• Securing credential storage and transmission
• Enforcing password and MFA policies
• Monitoring authentication activity

Implementation & Guidance

Comply Agent shows that organizations must deploy strong authentication controls and enforce policy-driven credential management.

Key Implementation Areas

1. Multi-Factor Authentication (MFA)

Organizations must implement MFA for:

• All user accounts
• Privileged and administrative access
• Critical systems and applications

MFA significantly reduces the risk of unauthorized access, even if credentials are compromised.

2. Password Policy Enforcement

Comply Agent shows that strong password policies must be implemented, including:

• Minimum length requirements
• Complexity rules
• Regular password rotation
• Prevention of password reuse

These controls ensure passwords remain secure and resistant to attacks.

3. Credential Management Procedures

Organizations must define procedures for:

• Credential creation and issuance
• Secure storage of authentication data
• Password reset and recovery processes

Proper management ensures credentials are handled securely throughout their lifecycle.

4. Authentication Monitoring and Logging

Comply Agent shows that authentication systems must generate logs and audit trails.

This includes:

• Tracking login attempts
• Monitoring successful and failed authentications
• Detecting anomalies or suspicious activity

Evidence Examples

Comply Agent shows:

• MFA configuration records and user enrollment logs
• Password policy documentation and enforcement reports
• Authentication system access logs and audit trails

Operational Details

Comply Agent shows the operational execution:

• Frequency: Quarterly
• Review Cycle: Quarterly
• Owner Role: IT Manager
• Responsible Role: IT Manager
• Automation Score: 75%
• Last Updated: 18 March 2026

This indicates that authentication controls are actively maintained with frequent reviews and high automation.

The 75% automation score suggests:

• Automated authentication systems (IAM, MFA)
• Continuous monitoring of login activity
• System-driven enforcement of policies

Compliance & Risk Management

Comply Agent shows the following attributes:

• Status: Not Started
• Compliance Status: N/A
• Control Type: Technical
• Maturity Level: Level 4
• Risk Domain: Identity and Access Management
• Clause Reference: ISO 27001:2022 A.5.17

This control is categorized as a Technical Control, supported by policies and procedures.

Key Risks Addressed

• Unauthorized system access
• Credential compromise and misuse
• Weak password and authentication practices
• Identity theft and impersonation

Although Comply Agent shows “Not Started”, the maturity level indicates a well-defined and structured control ready for implementation.

Framework Mappings

Comply Agent shows strong cross-framework alignment:

1. Primary Mapping

• ISO 27001:2022 – Annex A 5.17 (Exact Match)

2. Supporting Frameworks

• SOC 2 – CC6.1 (Related)
• NIST – IA-5 (Partial)
• GDPR – Article 32 (Related)

3. Extended Mappings

Comply Agent shows:

• DORA
• Article 10
• Article 11
• Article 12
• SOC 2
• CC6.1
• CC6.2
• CC6.3
• CC7.1

This demonstrates that authentication controls support identity verification, access security, and compliance across multiple frameworks.

Evidence Library

Comply Agent shows four key evidence categories:

1. Policy Document

• Review of password policy documentation

2. Procedure Document

• Review of credential management procedures

3. Access Logs (Auto-collected)

• Sample authentication logs to verify enforcement
• Source: Active Directory, Identity Provider

4. Configuration Files

• Review of system configuration settings related to authentication

This evidence ensures:

• Defined policies and procedures
• Secure implementation of authentication controls
• System-level validation through logs and configurations
• Audit-ready traceability of authentication enforcement

FAQs: ISO 27001 Authentication Information (Annex A 5.17) 

1. What is ISO 27001 Authentication Information control?

It is a control that ensures authentication mechanisms such as passwords and MFA are securely implemented and managed. This helps prevent unauthorized access and ensures identity verification.

2. What is the objective of Annex A 5.17?

The objective is to protect authentication information and enforce secure authentication practices. It ensures that only authorized users can access systems using validated credentials.

3. What evidence is required for audits?

Auditors expect password policies, credential management procedures, authentication logs, and configuration settings. These demonstrate that authentication controls are implemented and actively enforced.

4. Who is responsible for this control?

Comply Agent shows the IT Manager as the owner and responsible role. This ensures accountability for managing authentication systems and controls.

5. How often should authentication controls be reviewed?

Comply Agent shows a quarterly review cycle, ensuring authentication mechanisms remain effective and aligned with evolving threats.

6. Why is multi-factor authentication important?

Multi-factor authentication adds an additional layer of security beyond passwords. It significantly reduces the risk of unauthorized access even if credentials are compromised.