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Signature validity is determined by checking the authenticity of the signature's digital ID certificate status and document integrity: Authenticity verification confirms that the signer's certificate or its parent certificates exist in the validator's list of trusted identities.

Verifying the signatures of Amazon SNS messages Always use HTTPS when getting the certificate from Amazon SNS. Validate the authenticity of the certificate. Verify the certificate was received from Amazon SNS. When possible, use one of the supported AWS SDKs for Amazon SNS to validate and verify messages.

SIGv4A goes through a similar scoped credentials derivation process as SIGv4, except that it derives a credential that is valid for a single service, on a single day, and then it adds another step to derive a public-private ECDSA key pair from that scoped credential.

For a list of all the Amazon S3 Regions and the signature versions they support, see Regions and Endpoints in the AWS General Reference. For all AWS Regions, AWS SDKs use Signature Version 4 by default to authenticate requests.

The AWS SigV4 Library is a standalone library for generating signatures and authorization headers ing to the specifications of the AWS Signature Version 4 signing process. This library aids applications in sending direct HTTP requests to AWS services requiring SigV4 authentication.

You can also verify the digital signature by using the public key of the KMS key outside of AWS KMS. Use the GetPublicKey operation to download the public key in the asymmetric KMS key and then use the public key to verify the signature outside of AWS KMS.

To enable the SigV4 signing process, you need to make a small update to the ServiceA Python code that makes API calls to ServiceB. This change is to pass authentication information to AWS using the Authorization header when making API calls.