# Amazon KMS Reference
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The following reference material provide useful information about using and managing KMS keys. 
+ [**Key type reference**](symm-asymm-compare.md). Lists the type of KMS key that supports each Amazon KMS API operation.

  To find: Can I enable and disable an RSA signing KMS key?
+ [**Key state table**](key-state.md#key-state-table). Shows how the key state of a KMS key affects its use in Amazon KMS API operations.

  To find: Can I change the alias of a KMS key that is pending deletion?
+ [Amazon KMS**API permissions reference**](kms-api-permissions-reference.md). Provides information about the permissions required for each Amazon KMS API operation.

  To find: Can I run [GetKeyPolicy](https://docs.amazonaws.cn/kms/latest/APIReference/API_GetKeyPolicy.html) on a key in a different Amazon account? Can I allow `kms:Decrypt` permission in an IAM policy?
  + [ViaService reference](conditions-kms.md#viaService_table). Lists the Amazon services that support the `kms:ViaService` condition key.

    To find: Can I use the `kms:ViaService` condition key to allow a permission only when it comes from Amazon ElastiCache? What about Amazon Neptune?
+ [Amazon KMS pricing](http://www.amazonaws.cn/kms/pricing/). Lists and explains the price of KMS keys.

  To find: How much does it cost to use my asymmetric keys?
+ [Amazon KMS request quotas](requests-per-second.md#requests-per-second-table). Lists the per-second quotas for Amazon KMS API requests in each account and Region.

  To find: How many [Decrypt](https://docs.amazonaws.cn/kms/latest/APIReference/API_Decrypt.html) requests can I run in each second? How many [Decrypt](https://docs.amazonaws.cn/kms/latest/APIReference/API_Decrypt.html) requests can I run on KMS keys in my custom key store? 
+ [Amazon KMS resource quotas](resource-limits.md). Lists the quotas on Amazon KMS resources.

  To find: How many KMS key can I have in each Region of my account? How many aliases can I have on each KMS key?
+ [Amazon services integrated with Amazon KMS](https://aws.amazon.com/kms/features/#aws-service-integration). Lists the Amazon services that use KMS keys to protect the resources that they create, store, and manage.

  To find: Does Connect Customer use KMS keys to protect my Connect resources?