Dynamic secrets vs static secrets

Secrets form the foundation of cybersecurity access management. They include a diverse array of credentials used to authenticate and authorize access to digital resources, and it’s fair to say that the entire spectrum of cybersecurity revolves around them. 

As businesses embrace cloud technologies and microservices architectures, the proliferation of secrets has become a significant security concern and their effective management is necessary to ensure they’re properly stored, accessed, and rotated. 

Static secrets, like long-standing API-keys, have been the norm for years. However, dynamic secrets — short-lived, automatically generated credentials — are gaining traction. So let’s understand what’s what with these two types of secrets and see where that leads us.

What are static secrets?

Static secrets are long-lived credentials that remain unchanged for extended periods. These secrets, like encryption keys used to encrypt/decrypt sensitive info or API keys for third-party services, play a key role in non-human identity management, providing consistent access to protected resources. They are also heavily and traditionally used for user account access, service-to-service authentication, and application-to-database connections. 

Advantages of static secrets

Static secrets offer simplicity and ease of use, making them attractive for many organizations. Their straightforward nature allows for quick implementation and integration into applications, accelerating development cycles and reducing initial complexity. They have also been found to be quite compatible with legacy systems, and they don’t need many computational resources for authentication. 

Pitfalls of static secrets

The simplicity of static secrets introduces significant security risks far outweighing the pros. The problem is that static secrets remain unchanged over time, becoming increasingly vulnerable to exposure. If compromised, attackers can gain long-term access to sensitive systems or data. 

Consider a scenario where a company has used the same SSH key for years; if an attacker obtains it, they could maintain unauthorized server access indefinitely. Similarly, shared static database credentials across multiple applications in large enterprises can lead to widespread impact if compromised, affecting numerous business units and customer data. 

Furthermore, the widespread distribution of these credentials complicates auditing and tracking, making monitoring access and usage patterns challenging.

The Remedy

Organizations often employ centralized secret storage systems such as vaults as a recourse for such complications. And, sure, these tools are great since they provide encrypted storage, access controls, and auditing capabilities to help mitigate the risks associated with static secrets. Nonetheless, managing many static secrets across complex systems can become unwieldy, and we need to weigh these factors against the evolving needs of modern cybersecurity. 

Entro saves the day here with its comprehensive discovery, enrichment, and monitoring capabilities, complemented by misconfiguration alerts and anomaly detection. And the best part? You don’t have to worry about replacing your existing secrets vault — Entro will plug right in.

What are dynamic secrets?

Dynamic secrets represent a paradigm shift in managing non-human identities. They offer a sophisticated approach to securing machine-to-machine communications and automated processes. Unlike traditional static credentials, dynamic secrets are ephemeral and generated on demand to provide temporary access to resources.

At the core of dynamic secrets is zero-standing privileges (ZSP) for non-human identities. Instead of maintaining static secrets with broad permissions, dynamic secrets grant time-bound access tailored to specific tasks. This approach aligns perfectly with the principle of least privilege, ensuring that automated systems and applications only receive the permissions they need for the duration required.

How do dynamic secrets function?

In practice, dynamic secrets operate through a centralized system, such as secrets vaults. When a client application or service requests access, the system communicates with the target resource (e.g., a database, cloud service, or API endpoint) to create temporary credentials. These credentials are then provided to the requesting entity and automatically revoked once the defined time-to-live (TTL) expires or once a new request access is generated.

Advantages of dynamic secrets

Dynamic secrets offer several key advantages for managing machine identities:

• Scalability: Dynamic secrets can be easily implemented across various platforms, services, and cloud environments.
• Reduced attack surface: Short-lived API keys and SSH credentials minimize the window of opportunity for attackers targeting automated systems.
• Automated lifecycle management: The system handles the creation and revocation of non-human identities, reducing administrative overhead and potential human errors.

Dynamic secrets are particularly valuable in cloud-native and ephemeral environments such as containerized applications or serverless functions. In these contexts, where instances may be short-lived and frequently recreated, dynamic secrets provide a flexible and secure way to manage access to resources without the need for pre-provisioned credentials.

One particularly powerful application of dynamic secrets is in managing SSH access for automated processes. Instead of relying on static SSH keys that might be shared across multiple systems, dynamic secrets allow for the generation of unique, time-limited credentials. This approach significantly reduces the risk associated with compromised SSH keys, a common vector for lateral movement in breaches involving automated systems.

Challenges with dynamic secrets

Implementing dynamic secrets for non-human identities does not come without its challenges. It requires careful integration with existing systems and may introduce complexity in environments with long-running processes or legacy applications. Additionally, organizations must ensure their secrets management system is highly available to prevent access disruptions for critical automated tasks.

• Downtime/Outage risk – Both the systems creating dynamic secrets and the ones using it require high availability to prevent access disruptions and service outages. 
• Auditing  – Auditing dynamic secrets is more challenging than static ones. The transient nature of these credentials makes it all the more difficult to track who is using them at any given time, complicating compliance and security monitoring efforts.
• Support  –  There’s a lack of widespread support that can make the implementation and integration of dynamic secrets challenging, especially in heterogeneous environments.
• System latency  – The process of generating, distributing, and validating short-lived credentials in real time can introduce latency into system operations. This additional overhead, while often minimal, can become noticeable in high-traffic environments or time-sensitive applications.

The Remedy

Given these challenges, just-in-time (JIT) secrets may serve as a better alternative in certain scenarios. JIT secrets offer a more flexible approach by providing temporary, on-demand access without the need for continuously generating secrets and thus avoiding the hassle of their management. This model can be particularly beneficial for organizations dealing with legacy systems or long-running processes that struggle with the ephemeral nature of dynamic secrets. 

Entro can take JIT access to the next level by offering highly comprehensive non-human identity management. It provides holistic visibility of secrets across various environments, real-time monitoring and protection, and proactive risk identification and mitigation, addressing the broader spectrum of secrets management challenges beyond mere access control.

Comparison: dynamic secrets vs static secrets

Let’s compare the specifics of the two types of secrets point by point:

Criteria	Static secrets	Dynamic secrets
Security level	Moderate. Long-lived nature increases risk if compromised. Vulnerable to theft and unauthorized access over time.	High. Short-lived nature significantly reduces risk. Automatically rotated, minimizing exposure window.
Lifespan	Long-term, often months or years. May remain unchanged indefinitely if not manually rotated.	Short-term, typically hours or days. Automatically expires after a set time or usage.
Management complexity	Low to moderate. It is easier to implement and manage in small-scale environments. However, it can become complex with a large number of secrets.	Moderate to high. Requires more sophisticated management systems and processes. Automation needed.
Scalability	Limited. Manual rotation and management don’t scale well.	Highly scalable. Well-suited for cloud-native applications and microservices architectures. Automation enables easy scaling.
Auditability	Straightforward. Easier to track usage and changes over time. Traditional auditing tools work well.	More challenging. Difficult to track who is using ephemeral credentials at any given time. The rapid creation and destruction of temporary credentials complicates audit trails and monitoring.
Implementation effort	Low. Can be easily implemented in traditional environments. Often involves storing secrets in config files or code.	Moderate to high. Requires changes to application architecture and integration with secrets management systems although the initial setup can be complex.
Cost considerations	Lower initial cost. May incur higher long-term costs due to manual management and potential security risks.	Higher initial cost for implementation and tooling. Potentially lower long-term costs due to improved security and reduced manual effort.
Performance impact	Minimal. No additional processing is required for secret retrieval.	Slight overhead. Dynamic generation and retrieval of secrets may introduce minor latency. Impact is usually negligible with proper implementation.
Compatibility with legacy systems	High. Widely supported by older applications and infrastructure.	Limited. May require updates or adaptations to work with older systems. Best suited for modern, API-driven applications.
Suitability for different environments	Moderate suitability for various environments. Works well in on-premises and traditional setups. Limited benefits in dynamic cloud environments.	High suitability for cloud and containerized environments. Ideal for ephemeral infrastructure and serverless computing. Can be adapted for on-premises use with proper tooling.
Risk of credential theft	Higher risk. If compromised, static secrets can be exploited for extended periods.	Lower risk. Short lifespan limits the window of opportunity for attackers. Compromised credentials quickly become invalid.
Automation potential	Limited. Manual processes often required for rotation and management.	High. Well-suited for automated provisioning, rotation, and revocation. Integrates easily with CI/CD pipelines and IaC tools.
Compliance with security standards	Challenging. Manual rotation and limited audibility can make compliance difficult. May not meet stringent security requirements.	Easier. Automatic rotation and comprehensive logging facilitate compliance with standards like PCI DSS. Supports zero-trust security models.
Revocation	Manual and potentially disruptive. Revoking a static secret may impact multiple systems simultaneously.	Automatic and graular. Individual secrets can be revoked without affecting others. Supports fine-grained access control.
Use cases	Long-term storage of relatively stable credentials. Legacy systems with limited rotation capabilities. Situations where frequent changes are impractical.	Cloud infrastructure access. Microservices authentication.CI/CD pipelines. Database access for applications. API authentication for external service integrations.

Parting thoughts

All in all, as organizations continue to grapple with the complexities of managing the different types of secrets, it’s clear that we need a comprehensive approach to non-human identity management. While dynamic secrets offer enhanced security through their short-lived nature, the practical challenges of implementation and management can be daunting. Entro can help.

What sets Entro apart is its context-driven approach. Enriching each discovered secret with metadata it provides a fuller picture of the risk profile, enabling more effective remediation strategies. Plus, the platform’s ability to integrate with various tools and environments where secrets may be stored or exposed makes it a versatile solution for organizations of all sizes. 

Are you ready to take it to the next level? Click here to see Entro in action!