Benefits of KMS
AWS Key Management Service is a fully managed service, so you can focus on the encryption needs of your applications while AWS handles availability, physical security, and hardware maintenance of the underlying infrastructure.
Centralized Key Management
AWS Key Management Service provides you with centralized control of your encryption keys. KMS presents a single view into all of the key usage in your organization. You can easily create, import, and rotate keys as well as define usage policies and audit usage from the AWS Management Console or by using the AWS SDK or CLI.
Integrated with AWS services
AWS Key Management Service is integrated with several other AWS services to make it easy to encrypt the data you store with these services using keys that you manage.
Encryption for all your applications
AWS Key Management Service makes it easy to manage encryption keys used to encrypt data stored by your applications regardless of where you store it. KMS provides an SDK for programmatic integration of encryption and key management into your applications.
AWS Key Management Service works with AWS CloudTrail to provide you with logs of API calls made to or by KMS. These logs help you meet compliance and regulatory requirements by providing details of when keys were accessed and who accessed them.
There is no charge for the storage of default keys in your account. You pay only for additional master keys that you create and your key usage.
AWS Key Management Service provides you a secure location to store and use encryption keys, using FIPS 140-2 validated hardware security modules where your unencrypted keys are only used in memory. KMS keys are never transmitted outside of the AWS regions in which they were created.
Security and quality controls in AWS KMS have been validated and certified by a number of compliance schemes.