Cost-Efficient Digital Signature Generation for Device Manufacturers

Answer: C.

Option A is incorrect because CloudHSM is not a cost-efficient option.

Option B is incorrect because there is no SignDocument CloudHSM API and CloudHSM is not as cost-efficient as KMS.

Option C is CORRECT because KMS has the Sign API that creates a digital signature for a message or message digest using the private key in an asymmetric CMK.

Option D is incorrect because there is no RequestDocumentSignature API in AWS Certificate Manager.

AWS Certificate Manager provides functionality relating to the management of SSL Certificates.

Reference:

https://docs.aws.amazon.com/cloudhsm/latest/userguide/introduction.html https://docs.aws.amazon.com/cloudhsm/latest/userguide/key_mgmt_util-sign.html https://docs.aws.amazon.com/kms/latest/APIReference/API_Sign.html

In order to digitally sign firmware software to ensure its authenticity, there are several options available in AWS. The most cost-efficient option will depend on the specific needs and requirements of the device manufacturer.

Option A: Use the Sign command in key_mgmt_util in AWS CloudHSM AWS CloudHSM is a hardware security module (HSM) that provides secure key storage and cryptographic operations. The Sign command in key_mgmt_util can be used to sign data using a private key stored in the CloudHSM. This option may be appropriate for organizations that require the highest level of security and control over their keys, but it may not be the most cost-efficient option as CloudHSM can be expensive.

Option B: Use the SignDocument API provided by AWS CloudHSM AWS CloudHSM also provides a SignDocument API that can be used to sign digital documents using a private key stored in the CloudHSM. This option may be suitable for organizations that require the highest level of security and control over their keys, but it may not be the most cost-efficient option as CloudHSM can be expensive.

Option C: Use the Sign API provided by AWS KMS AWS Key Management Service (KMS) is a managed service that makes it easy to create and control encryption keys used to encrypt data. The Sign API provided by KMS can be used to sign data using a private key stored in KMS. This option may be more cost-efficient than CloudHSM as KMS is a managed service and does not require the use of hardware security modules.

Option D: Use the RequestDocumentSignature API provided by AWS Certificate Manager AWS Certificate Manager (ACM) is a service that lets you easily provision, manage, and deploy SSL/TLS certificates for use with AWS services. The RequestDocumentSignature API provided by ACM can be used to request a signature for a document using a private key stored in ACM. This option may be suitable for organizations that require a simple, low-cost solution for signing documents, but it may not be appropriate for signing firmware software.

In summary, the most cost-efficient option for digitally signing firmware software will depend on the specific needs and requirements of the device manufacturer. Option C (Use the Sign API provided by AWS KMS) may be the most cost-efficient option as it is a managed service and does not require the use of hardware security modules. However, if the highest level of security and control over keys is required, options A and B may be more appropriate, albeit more expensive. Option D may be suitable for signing documents, but may not be appropriate for signing firmware software.