Exam CAS-004 topic 1 question 287 discussion

Actual exam question from CompTIA's CAS-004

Question #: 287
Topic #: 1

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?

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

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Suggested Answer: A 🗳️

by sursur at Aug. 15, 2023, 3:36 p.m.

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weaponxcel

8 months, 1 week ago

Selected Answer: A

A. ChaCha20. ChaCha20 is a modern stream cipher that is known for its speed and simplicity. It is also considered to be a secure cipher. ChaCha20 is a good choice for encrypting high-throughput data streams, such as 4K video streams. The other options are not as well-suited for the organization's requirements: B. ECDSA is an elliptic curve signature algorithm. It is used for digital signatures, not encryption. C. Blowfish is a block cipher that is not as fast as ChaCha20. Blowfish is also not as widely supported as ChaCha20. D. AES-GCM is a block cipher that is more complex than ChaCha20. AES-GCM is also not as well-supported on endpoints without crypto instruction sets or coprocessors. E. AES-CBC is a block cipher that is more complex than ChaCha20. AES-CBC is also not as well-supported on endpoints without crypto instruction sets or coprocessors.

upvoted 2 times

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Meep123

8 months, 3 weeks ago

Selected Answer: A

ChaCha20 is more secure than RC4, and faster than AES

upvoted 1 times

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CXSSP

9 months ago

Selected Answer: A

ChaCha20

upvoted 1 times

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sursur

10 months, 2 weeks ago

Selected Answer: A

ChaCha20 is a stream cipher that is designed to be fast and efficient on a variety of hardware platforms, including those without crypto instruction sets or coprocessors. It is also a relatively new cipher, which means that it is less likely to have known vulnerabilities.

upvoted 4 times

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