FDA's Security Objectives: Your North Star

FDA's premarket cybersecurity guidance defines five security objectives every connected device must address: authenticity (including integrity), authorization, availability, confidentiality, and secure and timely updatability and patchability. Your security architecture is judged on how well it meets all five, and tradeoffs between them need documented rationale.

3.4.1 The Five Core Objectives

The FDA's 2025 guidance establishes five security objectives that every device must address. Think of these as the fundamental goals your security architecture must achieve:

1. Authenticity (Including Integrity)

What it means: Ensuring information and commands come from trusted sources and haven't been tampered with.

Why it matters:

• Prevents attackers from sending fake commands
• Ensures clinical data remains accurate
• Protects software from unauthorized changes

Example implementations:

• Digital signatures on software updates
• Cryptographic authentication for communications
• Integrity checking for stored data
• Code signing for applications

2. Authorization

What it means: Controlling who can do what with the device.

Why it matters:

• Prevents unauthorized users from changing settings
• Protects sensitive functions
• Enables accountability through user tracking

Example implementations:

• Role-based access control (clinician vs. technician)
• Multi-factor authentication for critical functions
• Privilege separation
• Audit logging of user actions

3. Availability

What it means: Ensuring the device works when needed.

Why it matters:

• Patients depend on devices for life-critical functions
• Downtime can delay treatment
• System failures can cascade across facilities

Example implementations:

• Redundant systems for critical functions
• Graceful degradation modes
• DOS (Denial of Service) protections
• Recovery procedures

4. Confidentiality

What it means: Protecting sensitive information from unauthorized access.

Why it matters:

• Patient privacy (HIPAA compliance)
• Preventing identity theft
• Protecting intellectual property

Example implementations:

• Encryption for data at rest
• Encrypted communications
• Secure storage of credentials
• Screen privacy timeouts

5. Secure and Timely Updatability/Patchability

What it means: Ability to fix security problems after deployment.

Why it matters:

• New vulnerabilities discovered constantly
• Threats evolve over time
• Devices may be in use for 10+ years

Example implementations:

• Secure update mechanisms
• Automated update capabilities
• Rollback procedures
• Update authentication

3.4.2 Balancing Security Objectives

These objectives often conflict with each other. For example:

• Strong authentication might reduce availability in emergencies
• Extensive authorization checks could impact device performance
• Confidentiality encryption might complicate troubleshooting

Your architecture must balance these tradeoffs based on:

• Clinical use cases
• Risk assessment results
• Regulatory requirements
• Stakeholder needs