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GSEC · Question #15

What is the main reason that DES is faster than RSA?

The correct answer is D. Symmetric cryptography is generally much faster than asymmetric.. DES is faster than RSA because symmetric encryption uses simpler mathematical operations compared to the computationally expensive modular exponentiation required by asymmetric algorithms.

Linux and Cryptography

Question

What is the main reason that DES is faster than RSA?

Options

  • ADES is less secure.
  • BDES is implemented in hardware and RSA is implemented in software.
  • CAsymmetric cryptography is generally much faster than symmetric.
  • DSymmetric cryptography is generally much faster than asymmetric.

How the community answered

(48 responses)
  • A
    2% (1)
  • B
    6% (3)
  • C
    13% (6)
  • D
    79% (38)

Why each option

DES is faster than RSA because symmetric encryption uses simpler mathematical operations compared to the computationally expensive modular exponentiation required by asymmetric algorithms.

ADES is less secure.

Security level and speed are independent properties; being less secure does not inherently make an algorithm faster, and this does not explain the architectural reason for the speed difference.

BDES is implemented in hardware and RSA is implemented in software.

Both DES and RSA can be implemented in hardware or software; the speed difference is fundamental to their algorithm designs, not their implementation medium.

CAsymmetric cryptography is generally much faster than symmetric.

This is the inverse of the correct relationship - asymmetric cryptography is generally much slower than symmetric due to its complex mathematical operations.

DSymmetric cryptography is generally much faster than asymmetric.Correct

Symmetric algorithms like DES use substitution and permutation operations on fixed-size blocks, which are computationally inexpensive and fast on both hardware and software. Asymmetric algorithms like RSA rely on mathematical problems such as large integer factorization, which require significantly more computation per operation. As a result, symmetric encryption is typically 1,000 to 10,000 times faster than asymmetric encryption for bulk data processing.

Concept tested: Symmetric vs asymmetric cryptography performance characteristics

Source: https://csrc.nist.gov/publications/detail/sp/800-175b/rev-1/final

Topics

#DES#RSA#symmetric cryptography#asymmetric cryptography

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