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ISC2 Systems Security Certified Practitioner (SSCP) Practice Question

Your company is building a serverless API on AWS that must encrypt individual JSON attributes (each <200 bytes) before writing them to Amazon DynamoDB. The solution should minimize CPU cycles in the Lambda functions, provide strong confidentiality, and scale to millions of records with simple key management. Which approach best meets these requirements?

  • Hash each attribute with SHA-256 and store only the hash value in DynamoDB to protect confidentiality

  • Encrypt each attribute directly with a 2048-bit RSA public key and store the corresponding private key in AWS Secrets Manager for decryption when needed

  • Request a 256-bit data key from AWS Key Management Service for each record and use it to encrypt the attribute locally with AES-256-GCM, storing the ciphertext and the encrypted data key in the table

  • Apply Elliptic Curve Integrated Encryption Scheme (ECIES) with a P-256 public key, keeping the private key in AWS CloudHSM for decryption

ISC2 Systems Security Certified Practitioner (SSCP)
Cryptography
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