Blockchain-enhanced certificateless signature scheme in the standard model

Area of Science:

• Computer Science
• Cybersecurity
• Cryptography

Background:

• The Internet of Things (IoT) is transforming society towards intelligence.
• Certificateless signatures (CLS) are crucial for IoT security, but existing schemes often rely on idealized security assumptions.
• Shim proposed a CLS scheme without random oracles, claimed to be secure in the standard model.

Purpose of the Study:

• To cryptanalyze Shim's CLS scheme and identify its security vulnerabilities.
• To propose a novel, secure, and efficient blockchain-based CLS scheme.
• To address the limitations of existing CLS schemes in realistic IoT environments.

Main Methods:

• Cryptanalysis of Shim's CLS scheme to evaluate its resistance to specific attacks.
• Development of a new CLS scheme leveraging blockchain technology.
• Security analysis of the proposed scheme against Type I and Type II attackers.
• Performance evaluation of computational and communication overhead.

Main Results:

• Shim's CLS scheme is found to be vulnerable to public key replacement attacks by Type I attackers.
• The proposed blockchain-based CLS scheme effectively resists Type I and Type II attackers.
• The new scheme prevents signature forgery against public parameters.
• The proposed scheme maintains comparable computational and communication performance to Shim's scheme.

Conclusions:

• Shim's CLS scheme has security flaws that need addressing for practical IoT applications.
• The proposed blockchain-based CLS scheme offers enhanced security and robustness.
• This new scheme provides a more secure and reliable solution for certificateless signatures in IoT environments.