Practice Test

True or False: The AWS Key Management Service (AWS KMS) is used to create and manage cryptographic keys and control their use across a wide range of AWS services.

  • True
  • False

Answer: True

Explanation: AWS KMS is a managed service that makes it easy for you to create and control the cryptographic keys used for data encryption.

AWS KMS supports which type of encryption?

  • A. Encryption at transit
  • B. Encryption at rest
  • C. Both A & B

Answer: C. Both A & B

Explanation: AWS KMS can be used for both encryption at rest (storing encrypted data) and encryption in transit (transmitting encrypted data).

True or False: You cannot import your own cryptographic keys into AWS KMS.

  • True
  • False

Answer: False

Explanation: AWS KMS allows you to import your own cryptographic keys, giving the user more flexibility and control.

Which AWS service does not integrate with AWS KMS?

  • A. AWS Lambda
  • B. AWS S3
  • C. AWS EC2
  • D. None of the above

Answer: D. None of the above

Explanation: All the services listed (AWS Lambda, AWS S3, AWS EC2) integrate with AWS KMS for encryption capabilities.

True or False: A customer master key (CMK) in AWS KMS is a logical representation of a cryptographic key.

  • True
  • False

Answer: True

Explanation: In AWS KMS, a CMK represents a cryptographic key and all of its associated metadata.

In AWS KMS, who manages the hardware security modules (HSMs) that perform cryptographic operations?

  • A. Customer
  • B. AWS
  • C. Both A and B
  • D. None of the above

Answer: B. AWS

Explanation: Within AWS KMS, AWS manages the HSMs, adding a layer of security and removing the hassle of hardware management from users.

True or False: In AWS KMS, Symmetric CMKs are used to encrypt and decrypt both small and large amount of data.

  • True
  • False

Answer: True

Explanation: Symmetric CMKs in AWS KMS are used to encrypt and decrypt up to 4 kilobytes (4096 bytes) of data and can also generate data keys to encrypt a large amount of data.

What AWS service would you use if you wanted to implement encryption at rest for an existing S3 bucket?

  • A. AWS Shield
  • B. AWS Secrets Manager
  • C. AWS KMS
  • D. AWS Certificate Manager

Answer: C. AWS KMS

Explanation: AWS KMS can be used to implement encryption at rest for an existing S3 bucket by configuring the bucket properties.

Which of the following is a benefit of using AWS KMS?

  • A. Centralize key management
  • B. Use your own cryptographic keys
  • C. Meet compliance requirements
  • D. All of the above

Answer: D. All of the above

Explanation: AWS KMS provides you with centralized key management, the ability to use your own cryptographic keys, and meets various compliance requirements.

True or False: AWS KMS is a regional service.

  • True
  • False

Answer: True

Explanation: AWS KMS is a regional service as keys are specific to the region in which they are created.

Interview Questions

What is AWS Key Management Service or AWS KMS?

AWS KMS is a managed service that allows you to create and control the encryption keys used in data encryption across AWS services and in your applications.

In which AWS service the data encryption at rest is enabled automatically?

Amazon S3, Amazon EBS, and Amazon Redshift are some of the services where the data encryption at rest is enabled automatically.

How does key rotation work in AWS KMS?

AWS KMS supports automatic key rotation. When you enable this feature, AWS KMS generates a new cryptographic material for your key every year.

What is a Customer Master Key (CMK) in AWS KMS?

A CMK is represented by an AWS KMS key. It is a logical representation of a master key and its key material.

Can AWS see my Keys when I use AWS KMS?

No, when you create a CMK in AWS KMS, the key material is securely stored, and even AWS can’t view it.

What is envelope encryption in AWS?

Envelope encryption is a practice where you use a master key to encrypt data keys instead of data directly. The master key is used to encrypt the plaintext data key and the resulting ciphertext data key is stored with the encrypted data.

Is it possible to import user-generated keys into AWS KMS?

Yes, AWS KMS enables you to import your keys from your key management infrastructure into AWS KMS.

Is AWS KMS compliant with HIPAA?

Yes, AWS KMS is compliant with HIPAA, allowing covered entities and their business associates subject to HIPAA to use AWS KMS to safeguard patient data in compliance with the regulations.

What types of CMKs can you create in AWS KMS?

You can create CMKs with AWS managed key material, CMKs with customer managed key material and CMKs with imported key material.

How many different keys can you create within AWS KMS?

You can create up to 1000 CMKs per Region within an AWS account.

What is the purpose of the AWS KMS Key policy?

The AWS KMS key policy defines who can use the CMK and under what conditions.

Can you track the usage of keys in AWS KMS?

Yes, you can use AWS CloudTrail to keep an audit log of all uses of your keys.

What happens when you delete a key in AWS KMS?

When you schedule a CMK for deletion, it’s status changes to Pending Deletion and it remains in this state for a minimum of 7 days during which the deletion can be canceled.

Is it possible to increase the number of keys that can be created in AWS KMS beyond the default limit?

Yes, you can request a quota increase from AWS to create more CMKs per Region in your AWS account.

What is the benefit of using AWS KMS for encryption at rest?

AWS KMS integrates with other AWS services to provide an easy and cost-effective way to use encryption and key management, thereby enhancing security by providing centralized control over cryptographic keys, and visibility into their usage.

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