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Norton's theorem is a fundamental concept in the field of electrical engineering that allows for the simplification of complex AC circuits. The theorem states that any two-terminal linear network can be replaced with an equivalent circuit that consists of an impedance, which is parallel with a constant current source. Figure 1 shows the AC circuit portioned into two parts: Circuit A and Circuit B, while Figure 2 depicts the circuit obtained by replacing Circuit A by its Norton equivalent...
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A practical key recovery attack on the lightweight WG-5 stream cipher.

Lin Ding1, Zhiyi Liao1, Zhengting Li1

  • 1PLA SSF Information Engineering University, Zhengzhou 450001, China.

Heliyon
|January 25, 2024
PubMed
Summary

Researchers discovered a significant slide property weakness in the WG-5 lightweight stream cipher, enabling efficient key recovery attacks. This finding highlights security vulnerabilities in WG-5 for resource-constrained devices.

Keywords:
CryptanalysisLightweight cryptographySlide attackStream cipherWG-5

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Area of Science:

  • Cryptography
  • Information Security
  • Computer Science

Background:

  • WG-5 is a lightweight stream cipher designed for resource-constrained devices like RFID tags and smart cards.
  • Existing security analyses of WG-5 have not identified the slide property weakness.

Purpose of the Study:

  • To explore and analyze the slide property of the WG-5 stream cipher for the first time.
  • To propose key recovery attacks based on the identified slide property.
  • To evaluate the security of WG-5 in a related-key setting.

Main Methods:

  • Theoretical analysis of the slide property to determine the probability of shifted keystreams.
  • Experimental verification of the theoretical probability.
  • Development and implementation of key recovery attacks utilizing the slide property.
  • Performance evaluation of the attack complexity and time requirements.

Main Results:

  • The slide property of WG-5 was quantified, showing a high probability of generating shifted keystreams with related keys.
  • An 80-bit secret key recovery attack was demonstrated with a time complexity of O(2^10.6), requiring 6 related keys and specific keystream bits.
  • The attack was experimentally validated, breaking WG-5 on a standard PC in under 100 seconds.

Conclusions:

  • The WG-5 stream cipher exhibits significant security weaknesses due to its slide property.
  • The current design of WG-5 is not sufficiently secure for its intended lightweight applications.
  • WG-5 requires design improvements to enhance its security against cryptanalytic attacks.