Aws Kms

Posted : admin On 1/3/2022

Cloud security refers to a set of policies, technologies or controls that are used to protect data, applications and associated infrastructure. Organizations want their deployed resources and workload to be safe from any potential security threat. AWS KMS (Key Management Service) provides security in terms of encryption to your cloud resources in AWS.

Latest Version Version 3.37.0. Published 2 days ago. Published 10 days ago. Published 17 days ago. Published 24 days ago. AWS Key Management Service (AWS KMS) is a managed service that makes it easy for you to create and control customer master keys (CMKs), the encryption keys used to encrypt your data. AWS Key Management Store (KMS) is a managed service that enables you to easily encrypt your data. AWS KMS provides a highly available key storage, management, and auditing solution for you to encrypt data within your own applications and control the encryption of stored data across AWS services.

What is Key Management Service (KMS)?

AWS KMS (Key Management Service) is an encryption service provided by AWS that enables the user to easily encrypt their data. KMS provides a key storage management solution so that data can be encrypted across AWS services and resources within a single AWS account. The easiest method to get started on KMS is to check off the box to encrypt your data within supported AWS services. In this case, default keys created by AWS in user’s account are used. KMS also allows users to create their own keys or CMKs (Customer Master Keys) to have further control over the management of their AWS resources. KMS assigns keys to be used in supported services of AWS when creating encrypted resources and also allows to use them directly within existing applications. It also gives the provision of usage policies to configure which user can use which key to encrypt or decrypt data.

Why KMS key rotation is necessary for AWS users?

The best cryptographic practices do not encourage excessive use of old CMK. It is highly recommended to rotate your CMK’s to ensure the security of your cloud infrastructure. When automatic key rotation is enabled, KMS generates new cryptographic material every 365 days and retains the older cryptographic material (old key). In this way, both keys can be used to encrypt or decrypt data. There are various benefits of enabling automatic rotation of CMK. Properties of CMK’s such as key ID, key ARN, policies, permissions do not change. It is not required by the user to remember any schedule or calendar to update CMK.

How does Centilytics assist you in ensuring security through KMS?

Centilytics recommends focusing on timely rotation and management of keys to ensure higher security levels of your cloud environment. A dedicated insight is provided which on KMS key rotation checks whether key rotation for your AWS account is enabled or not.

Insight descriptions

There can be 2 possible scenarios:

OKThis indication will be shown when key rotation is enabled for the corresponding CMK created by AWS user i.e. CMK will be rotated automatically in 365 days by AWS.
CRITICALThis indication will be shown when key rotation is disabled for the corresponding CMK created by AWS user i.e. CMK will not be rotated automatically by AWS.

Description of further columns are as follows:

  1. Account Id: This column shows the respective account ID of the user’s account.
  2. Account Name: This column shows the corresponding account name to the user’s account.
  3. Identifier: This column shows the unique CMK ID or key ID to uniquely identify and differentiate different keys in AWS.
  4. Key Rotation Status: This column shows the key rotation status of the corresponding AWS account. If the key rotation is active, then enabled will be displayed. Otherwise disabled will be displayed.

Compliances covered:

Compliance NameReference No.Link
ISO 27001A.12.4.1, A.12.4.3
NIST 800-53SC-12, SC-13,SC-17,SC-28
GDPRArticle 30

Filters applicable:

Filter NameDescription
Account IdApplying account Id filter will display data for the selected account Id.
SeverityApplying severity filter will display data according to the selected severity type i.e. selecting critical will display all resources with critical severity. Same will be the case for warning and ok severity types
Resource TagsApplying resource tags filter will display those resources which have been assigned the selected resource tag. For e.g.- If the user has tagged some resource by a tag named environment, then selecting an environment from the resource tags filter will display all the data accordingly.
Resource Tags ValueApplying resource tags value filter will display data which will have the selected resource tag value. For e.g.- If the user has tagged some resource by a tag named environment and has given it a value say production (environment: production), then the user will be able to view data of all the resources which are tagged as “environment:production”. User can use the tag value filter only when a tag name has been provided.

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Easily create and control the keys used to encrypt or digitally sign your data

AWS Key Management Service (KMS) makes it easy for you to create and manage cryptographic keys and control their use across a wide range of AWS services and in your applications. AWS KMS is a secure and resilient service that uses hardware security modules that have been validated under FIPS 140-2, or are in the process of being validated, to protect your keys. AWS KMS is integrated with AWS CloudTrail to provide you with logs of all key usage to help meet your regulatory and compliance needs.

Try AWS Key Management Service

AWS Free Tier includes 20,000 free AWS Key Management Service requests each month.


Fully managed

You control access to your encrypted data by defining permissions to use keys while AWS KMS enforces your permissions and handles the durability and physical security of your keys.

Centralized key management

AWS KMS presents a single control point to manage keys and define policies consistently across integrated AWS services and your own applications. You can easily create, import, rotate, delete, and manage permissions on keys from the AWS Management Console or by using the AWS SDK or CLI.

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Manage encryption for AWS services

AWS KMS is integrated with AWS services to simplify using your keys to encrypt data across your AWS workloads. You choose the level of access control that you need, including the ability to share encrypted resources between accounts and services. KMS logs all use of keys to AWS CloudTrail to give you an independent view of who accessed your encrypted data, including AWS services using them on your behalf.

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Encrypt data in your applications

AWS KMS is integrated with the AWS Encryption SDK to enable you to used KMS-protected data encryption keys to encrypt locally within your applications. Using simple APIs you can also build encryption and key management into your own applications wherever they run.

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Digitally sign data

AWS KMS enables you to perform digital signing operations using asymmetric key pairs to ensure the integrity of your data. Recipients of digitally signed data can verify the signatures whether they have an AWS account or not.

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Low cost

There is no commitment and no upfront charges to use AWS KMS. You only pay US $1/month to store any key that you create. AWS managed keys that are created on your behalf by AWS services are free to store. You are charged per-request when you use or manage your keys beyond the free tier.

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AWS KMS uses hardware security modules (HSMs) that have been validated under FIPS 140-2, or are in the process of being validated, to generate and protect keys. Your keys are only used inside these devices and can never leave them unencrypted. KMS keys are never shared outside the AWS region in which they were created.

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The security and quality controls in AWS KMS have been certified under multiple compliance schemes to simplify your own compliance obligations. AWS KMS provides the option to store your keys in single-tenant HSMs in AWS CloudHSM instances that you control.

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Built-in auditing


AWS KMS is integrated with AWS CloudTrail to record all API requests, including key management actions and usage of your keys. Logging API requests helps you manage risk, meet compliance requirements and conduct forensic analysis.

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Blog posts & articles

Read about AWS Key Management Service security, compliance, and availability.

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