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ISC2 Systems Security Certified Practitioner (SSCP) Practice Question

A fintech startup on AWS has a Lambda function that submits JSON trade orders over TLS to an internal REST API behind an Application Load Balancer. Regulators require each order to be tamper-evident and ensure the caller cannot later deny sending it. The team needs a low-maintenance solution that avoids running its own certificate authority. Which approach best satisfies the non-repudiation requirement for every order?

  • Compute an HMAC-SHA256 over each order using a secret in AWS Secrets Manager; have the API verify the HMAC with the same key.

  • Add a CRC32 checksum header to each request and validate it in the API before processing the order.

  • Invoke the AWS KMS Sign API with an asymmetric key to create an RSA digital signature of each payload, and let the API verify it using the public key.

  • Enable CloudTrail data events for the API and store the logs in an S3 bucket with Object Lock to create immutable evidence of every call.

ISC2 Systems Security Certified Practitioner (SSCP)
Cryptography
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