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A Lightweight Cipher Based on Salsa20 for Resource-Constrained IoT Devices.

Evangelina Lara1, Leocundo Aguilar2, Jesús A García3

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Sensors (Basel, Switzerland)
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PubMed
Summary

This study introduces Generador de Bits Pseudo Aleatorios (GBPA), a new stream cipher for resource-constrained Internet of Things (IoT) devices. GBPA offers enhanced security for IoT systems without compromising their limited computing power.

Keywords:
Internet of ThingsSalsa20cipher

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Area of Science:

  • Cryptography
  • Computer Science
  • Embedded Systems

Background:

  • The Internet of Things (IoT) paradigm enables interconnected devices for enhanced decision-making.
  • IoT devices are highly vulnerable to security attacks due to their constrained computing and energy resources.
  • Current cryptographic ciphers are often too resource-intensive for implementation on low-power IoT devices.

Purpose of the Study:

  • To present Generador de Bits Pseudo Aleatorios (GBPA), a stream cipher specifically designed for Class 0 resource-constrained IoT devices.
  • To enable low-cost IoT devices to implement robust security services, protecting user data privacy and system integrity.
  • To offer a secure alternative to existing ciphers that are unsuitable for the limitations of IoT hardware.

Main Methods:

  • Developed GBPA, a stream cipher based on the Salsa20 algorithm, optimized for minimal program and data memory requirements.
  • Evaluated GBPA's cryptographic output using three statistical test suites: NIST STS, DIEHARD, and EACirc.
  • Compared GBPA's resource footprint against Salsa20 and other lightweight ciphers.

Main Results:

  • GBPA demonstrated lower program and data memory requirements compared to Salsa20 and other lightweight ciphers.
  • Statistical tests (NIST STS, DIEHARD, EACirc) indicated good output quality for GBPA.
  • The cipher is suitable for approximately 29.5% of embedded systems in the market, enabling security for previously unprotected devices.

Conclusions:

  • GBPA provides a viable security solution for resource-constrained IoT devices, addressing a critical gap in current IoT security.
  • The implementation of GBPA enhances data privacy and system protection without negatively impacting the performance of IoT devices.
  • This development allows a significant portion of embedded systems to benefit from advanced cryptographic security, previously unattainable due to hardware limitations.