AWS Secrets Manager vs. Systems Manager Parameter Store - Choosing the Right Solution for Your Needs
Tags: aws, cloud, security, beginners
Published: 2023-09-21 10:57:16

AWS offers two powerful tools, *AWS Secrets Manager* and *Systems Manager Parameter Store*. These services are essential for securely managing secrets and configuration data in your AWS environment.

Here, we'll compare AWS Secrets Manager and Systems Manager Parameter Store to help you make a choice for your specific requirements. Whether you're an experienced AWS user or just confused starting, this comparison will guide you in choosing the right solution for your cloud security and configuration management needs.




## I. AWS Secrets Manager

AWS Secrets Manager is a robust service designed for the secure management of sensitive information within AWS environments.  It provides a centralized repository for secrets, reducing the risk of accidental exposure and simplifies the task of storing, retrieving, and rotating credentials, API keys, and other secrets. 



## II. Systems Manager Parameter Store

Systems Manager Parameter Store is another valuable service provided by AWS, offering secure management of configuration data and secrets. Systems Manager Parameter Store is designed for storing and managing configuration data, secrets, and other information. It provides a secure and centralized location for these critical assets. And now you see how those two services sound similar. We'll take a look at the similarities and the differences down below. Let's dive in!








## III. Comparing AWS Secrets Manager and Systems Manager Parameter Store

Let's dive into a detailed comparison of AWS Secrets Manager and Systems Manager Parameter Store to help you make an informed decision based on your specific needs. We'll explore various aspects of both services:

- **Ease of Use**:
  Both services offer similar UIs on which you can declare key-values pairs for your parameters and secrets.

- **Storage and Encyrption**:
When it comes to data storage and encryption, both AWS Secrets Manager and Systems Manager Parameter Store offer robust capabilities, but with some notable differences. 
 - **AWS Secrets Manager**: It allows you to store secrets with a generous size limit of up to 64KB. These secrets can include sensitive information like passwords, API keys, and other confidential data. Encryption is seamlessly integrated with AWS Key Management Service (KMS), ensuring that your secrets remain secure. However, it's important to note that AWS Secrets Manager is primarily designed for secret management.
 - **Systems Manager Parameter Store**: It provides flexibility in data storage. Standard Parameters can hold values of up to 4KB (4096 characters), while Advanced Parameters can accommodate larger entries, up to 8KB. Unlike AWS Secrets Manager, Parameter Store's primary use case extends beyond secrets. It is designed to manage various configuration variables, including URLs, database hostnames, custom settings, product keys, and more. While encryption is an option, it's not enforced by default. You can choose to enable encryption explicitly for added security. Encryption in Parameter Store is also handled via AWS KMS, requiring KMS Decrypt permissions for applications retrieving encrypted values.



- **Version Control**:
  - **AWS Secrets Manager**: It allows multiple versions to exist at the same time when you are performing a secret rotation. Secrets Manager distinguishes between different versions by the staging labels. 
  - **Systems Manager Parameter Store**: Parameter Store only allows one version of the parameter to be active at any given time. 

- **Secret Rotation**:
 - **AWS Secrets Manager**: It offers the ability to switch secrets at any given time and can be configured to regularly rotate depending on your requirements.
  - **Systems Manager Parameter Store**: In contrast, Systems Manager Parameter Store does not provide the same level of automated secret rotation as AWS Secrets Manager. While Parameter Store is a nice tool for managing configuration data and secrets, it does not offer built-in automation for secret rotation. If you rely on Parameter Store for secrets you may need to implement custom rotation processes to achieve the same level of security that AWS Secrets Manager provides.



- **Cross-Account Access**:

 - **AWS Secrets Manager:** It offers a convenient feature for cross-account access. You can configure secrets in AWS Secrets Manager to be accessed from another AWS account. This is particularly useful when you have secrets that are centrally managed in one AWS account but need to be accessed by applications or services running in different accounts. You can set up IAM roles or permissions that allow the necessary cross-account access, ensuring that your secrets remain protected while enabling secure sharing between AWS accounts.
 - **Systems Manager Parameter Store:** It also provides options for cross-account access, although the process may require more manual configuration compared to AWS Secrets Manager. You can implement IAM roles and policies to grant access to Parameter Store parameters from another AWS account. While this approach allows for cross-account access, it may involve additional setup steps and management efforts.


- **Pricing**
 - **AWS Secrets Manager:** AWS Secrets Manager operates on a pay-as-you-go model, meaning you are billed based on your usage. While it offers advanced secret management features, these come at a cost from the very beginning.
 - **Systems Manager Parameter Store:** One of the standout advantages of Systems Manager Parameter Store is that it offers a free tier, allowing you to store up to 10,000 parameters at no cost. This can be particularly cost-effective for organizations with a substantial need for parameter management. If you require more advanced functionality for your parameters, such as setting expiration dates or time-to-live, you can choose to use Advanced Parameters, which comes at an additional cost!


>Secrets Manager is purpose-built for the secure management of sensitive information, and as such, it enforces encryption by default when you create a secret. This means that you can never store data in plaintext within Secrets Manager, ensuring that your confidential information remains protected. Additionally, Secrets Manager offers a convenient built-in password generator accessible through the AWS CLI. This feature proves invaluable when you need to create resources like an RDS (Relational Database Service) instance using a CloudFormation template. With the password generator, you can effortlessly generate a randomized, highly secure password and later reference it in your RDS configuration, enhancing the overall security of your resources.



![Comparison Table](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/ervgnaleim4fyho1e1jk.png)

[Image-source](https://tutorialsdojo.com/aws-secrets-manager-vs-systems-manager-parameter-store/)



## IV. How to Choose Between AWS Secrets Manager and Systems Manager Parameter Store

Choosing between AWS Secrets Manager and Systems Manager Parameter Store boils down to your specific needs:

- **AWS Secrets Manager:** Opt for AWS Secrets Manager if you require robust secret management with features like automated rotation, audit logging, and seamless AWS service integration. It's ideal for securing confidential data.

- **Systems Manager Parameter Store:** If you need a versatile solution for managing both secrets and non-secret configuration data, especially in larger quantities, Systems Manager Parameter Store, with its free tier and parameter policies, is a cost-effective choice.

Evaluate your security and cost requirements to make the right choice for your cloud environment.






In a nutshell, AWS Secrets Manager excels in securing confidential data, providing automated rotation, audit logging, and seamless integration with AWS services.

On the other hand, Systems Manager Parameter Store, on the other hand, offers versatility, cost-effectiveness, and a free tier for managing both secrets and non-secret configuration data.

The choice between these services hinges on your specific requirements, balancing security, scalability, and cost considerations. Evaluate your needs carefully to make the right selection for your AWS environment.