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ISC2 Systems Security Certified Practitioner (SSCP) Practice Question

An e-commerce company runs a Node.js API on Amazon EC2 behind an Application Load Balancer. Each request is decrypted by an in-house module that uses a 2048-bit RSA private key to unwrap session tokens. A penetration tester submits thousands of carefully crafted ciphertexts and, by measuring millisecond-level differences in the API's responses, starts to infer bits of the private key. Which change would most directly disrupt the tester's timing-side-channel technique?

  • Enable RSA blinding (or implement a true constant-time exponentiation routine) so decryption time is no longer correlated with the attacker's chosen ciphertext.

  • Replace the Application Load Balancer with a Network Load Balancer to reduce network latency fluctuations.

  • Upgrade the key from 2048 bits to 4096 bits to increase computational effort for brute-force attacks.

  • Store the private key in AWS CloudHSM but keep the same application-level decryption logic.

ISC2 Systems Security Certified Practitioner (SSCP)
Cryptography
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