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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?

  • 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.

  • 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.

  • 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.

ISC2 Systems Security Certified Practitioner (SSCP)
Cryptography
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