ISC2 Systems Security Certified Practitioner (SSCP) Practice Question
A financial services firm uses Amazon EC2 Linux instances to generate a fresh 256-bit AES key for each transaction. Incident reviews show key creation sometimes blocks on /dev/random when entropy is exhausted, delaying processing. The team must eliminate these delays yet maintain high-quality randomness. Which approach best meets the entropy requirement?
Increase the symmetric key size to 512 bits so fewer keys need to be created over time.
Replace all /dev/random calls with /dev/urandom to prevent blocking during key generation.
Generate the keys inside an AWS CloudHSM cluster that provides a dedicated hardware random number generator.
Seed the instances' software random number generator with the system clock and store a pool of pre-generated random bytes in Amazon S3.
Using a hardware security module such as AWS CloudHSM addresses both needs. Each CloudHSM appliance includes a FIPS-validated hardware random number generator that continuously supplies high-quality entropy to its deterministic random bit generator, allowing rapid creation of strong cryptographic keys without blocking. Switching to /dev/urandom may avoid blocking but offers lower assurance of fresh hardware-based entropy, which some high-assurance environments require. Increasing the key size or caching random bytes does not resolve the underlying shortage of entropy and can introduce new risks. Therefore, generating keys inside AWS CloudHSM is the most suitable choice.
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ISC2 Systems Security Certified Practitioner (SSCP)
Cryptography
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