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300-730 · Question #145

What are two differences between ECC and RSA? (Choose two.)

The correct answer is B. ECC can have the same security as RSA but with a shorter key size. D. Key generation in ECC is faster and less CPU intensive than RSA. ECC achieves equivalent cryptographic security to RSA using much shorter key lengths, which directly results in faster key generation and lower CPU consumption compared to RSA.

Secure Communications

Question

What are two differences between ECC and RSA? (Choose two.)

Options

  • AKey generation in ECC is slower and more CPU intensive than RSA.
  • BECC can have the same security as RSA but with a shorter key size.
  • CECC cannot have the same security as RSA, even with an increased key size.
  • DKey generation in ECC is faster and less CPU intensive than RSA.
  • EECC lags in performance when compared with RSA.

How the community answered

(35 responses)
  • A
    6% (2)
  • B
    89% (31)
  • C
    3% (1)
  • E
    3% (1)

Why each option

ECC achieves equivalent cryptographic security to RSA using much shorter key lengths, which directly results in faster key generation and lower CPU consumption compared to RSA.

AKey generation in ECC is slower and more CPU intensive than RSA.

This is the opposite of the truth - ECC key generation is faster and less CPU-intensive than RSA because it operates on much smaller key sizes for equivalent security.

BECC can have the same security as RSA but with a shorter key size.Correct

ECC is based on elliptic curve discrete logarithm mathematics, which provides a higher security-per-bit ratio than RSA's integer factorization - a 256-bit ECC key offers roughly the same security strength as a 3072-bit RSA key, significantly reducing key storage and transmission overhead.

CECC cannot have the same security as RSA, even with an increased key size.

ECC can absolutely achieve the same or greater security level as RSA; at sufficient key lengths, ECC provides equivalent protection, making this statement factually incorrect.

DKey generation in ECC is faster and less CPU intensive than RSA.Correct

Because ECC key sizes are far smaller than RSA keys of equivalent security strength, the computational work required to generate keys and perform cryptographic operations is substantially less, making ECC faster and less CPU-intensive than RSA.

EECC lags in performance when compared with RSA.

ECC generally outperforms RSA in both speed and resource efficiency due to its smaller key sizes and more efficient underlying mathematics, so this statement is incorrect.

Concept tested: ECC vs RSA key size and computational efficiency

Source: https://www.cisco.com/c/en/us/about/security-center/elliptic-curve-cryptography.html

Topics

#ECC#RSA#key generation#asymmetric encryption

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