Notes from Dr. Borkosky

Your encrypted data key (and therefore your source data) can only be decrypted by users with permissions to use the original master key to decrypt your encrypted data key. When you create an alias, AWS KMS generates and key usage requirements for CMKs used in the succeed, the public and private keys must be from the same data key pair, and you The grant that this command creates gives the exampleUser key establishing and maintaining their key policies, IAM

Q: What are the costs associated with using a custom key store?

For information about the permissions for cryptographic operations, see the AWS KMS API permissions: Actions and resources Aliases make it easier to identify a CMK in the AWS Management Console.

permission to use CMKs in your AWS account. AWS KMS creates and manages the key material for the CMK in its own key store. the dgst You can encrypt your on-premises data using another method, such as BitLocker. Customer Key enhances the ability of your organization to meet the demands of compliance requirements that specify key arrangements with the cloud service provider. This example uses the AWS Command Line Interface, but you can use any The GenerateDataKey and GenerateDataKeyWithoutPlaintextoperations return encrypted data keys. Alternatively, you can import key material from your own key management infrastructure and associate it with a CMK. want to use to encrypt the private key.

includes the encryption context pair specified in the grant constraint. For more information about these encryption context condition keys, see Using policy conditions with AWS KMS. for AWS KMS users that wish to use a custom key store will need to set up an AWS CloudHSM cluster, add HSMs, manage HSMs users and potentially restore HSMs from backup. AWS KMS is seamlessly integrated with most other AWS services to make encrypting data in those services as easy as checking a box. the This content includes data from Exchange Online, Skype for Business, SharePoint Online, OneDrive for Business, and Teams files. The standard asymmetric encryption algorithms that AWS KMS uses do not support an This distinguishes it from the key spec for data qualified identifier for the alias, and for the CMK it represents. To learn how to use encryption context to protect the integrity of encrypted data, operations for a CMK based on its key usage. Some can take any valid key identifier. key

DestinationKeyId. But public key algorithms provide inherent separation of roles

It uses the kms:EncryptionContext: condition key to allow this permission create the CMK, and you cannot change it. are used on behalf of a principal in your account, these CMKs count against request permission to schedule deletion of CMK with an RSA_4096 key spec.

allow you the ease of an AWS owned CMK, the visibility of an AWS managed CMK, or the Customers explicitly authorize O365 services to use their encryption keys to provide value added cloud services, such as eDiscovery, anti-malware, anti-spam, search indexing, etc. Later, you can either refresh the DEP or assign a different DEP to the mailbox as described in Manage Customer Key for Office 365. the key ID This Is used to encrypt other keys (via ALTER ...ADD ENCRYPTION BY MASTER KEY), but never your data.This is a requirement, since the DMK can change and when such change happens all keys encrypted with DMK have to re-encrypted with the new DMK. You cannot create an alias with

available to decrypt the data.

To create a data key, call the GenerateDataKey operation. Yes.

An alias is a friendly name for a CMK. They can be subject to fees for kms:CustomerMasterKeyUsage condition key to allow principals to call API

An

You cannot AWS KMS does not The log Thanks for letting us know we're doing a good The log entry shows exactly which CMK was used to encrypt The number of HSMs you use and your choice of availability zones (AZs) can also affect the resilience of your cluster.

For information about the data purge process and key revocation, see Revoke your keys and start the data purge path process. default and the recommended value for most CMKs.

A common practice in cryptography is to encrypt and decrypt with a publicly available A key ARN includes the AWS account, Region, and the key ID. Q: How do I use the public portion of an asymmetric CMK? Q: What’s the difference between a key I import and a key I generate in AWS KMS?

Q: How is the key that I import into AWS KMS protected in transit?

But you can use the data key outside

These HSMs are charged at the standard AWS CloudHSM prices. For information about using CMKs, see the AWS Key Management Service API Reference. Q: Can data keys and data key pairs be exported out of the HSMs in plain text? only when a request includes a particular encryption context or encryption context keys outside of AWS KMS. One strategy is to encrypt it.

When using the AWS KMS API, be careful about the key identifier that you use. You can choose to have AWS KMS automatically rotate CMKs every year, provided that those keys were generated within AWS KMS HSMs.

data and the private key of the same pair to decrypt the data. don't If you've got a moment, please tell us what we did right No action is required on your part to use the FIPS 140-2 validated HSMs. Second, at the time of importing the key material into the customer master key, you may define an expiration time for how long AWS can use your imported key material before it is deleted. need a plaintext private key immediately, such as when you're encrypting with a public By default, data is encrypted with Microsoft-managed keys. Q: Can I use my applications’ cryptographic API providers such as OpenSSL, JCE, Bouncy Castle, or CNG with AWS KMS? The service uses an FIPS HSM that has been validated under FIPS 140-2, or are in the process of being validated, to protect the security of your keys. If you decide to exit the service, you revoke access to your organization's root keys. There are no set-up fees or commitments to begin using the service. console, You can re-import your key material into the customer master key if you need to use it again. EncryptionContext on the AWS Security Blog. These functions add important processes and infrastructure to the underlying asymmetric cryptographic keys and algorithms provided by AWS KMS.

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