CompTIA CASP+ (CAS-004) — Question 238

An organization had been leveraging RC4 to protect the confidentiality of a continuous, high-throughput 4K video stream but must upgrade to a more modern cipher. The new cipher must maximize speed, particularly on endpoints without crypto instruction sets or coprocessors. Which of the following is MOST likely to meet the organization's requirements?

Answer options

• A. ChaCha20
• B. ECDSA
• C. Blowfish
• D. AES-GCM
• E. AES-CBC

Correct answer: A

Explanation

ChaCha20 is optimized for performance on systems without hardware acceleration, making it an excellent choice for the organization's requirements. ECDSA is a digital signature algorithm, not a cipher for encryption. Blowfish, while fast, is not as modern or efficient as ChaCha20, and AES-GCM and AES-CBC, though secure, may not perform as well on devices lacking dedicated cryptographic support.