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Fingerprinting protocol for images based on additive homomorphic property
Minoru Kuribayashi1, Hatsukazu Tanaka
1Faculty of Engineering, Kobe University, Kobe 657-8501, Japan. minoru@eedept.kobe-u.ac.jp
Summary
This study introduces a novel fingerprinting protocol using the Okamoto-Uchiyama encryption scheme. It enhances enciphering rates and simplifies watermarking for secure transactions.
Area of Science:
- Cryptography
- Information Security
- Computer Science
Background:
- Homomorphic properties of public-key cryptosystems are crucial for protocols like electronic cash and voting systems.
- Existing fingerprinting protocols leverage these properties but suffer from low enciphering rates and difficult watermarking implementation.
Purpose of the Study:
- To propose a new fingerprinting protocol that overcomes the limitations of current schemes.
- To improve the enciphering rate and facilitate the implementation of watermarking techniques in cryptographic fingerprinting.
Main Methods:
- The study applies the additive homomorphic property of the Okamoto-Uchiyama encryption scheme.
- A novel method for embedding encrypted information without revealing the plaintext value is developed.
Main Results:
- The proposed fingerprinting scheme achieves an enciphering rate comparable to the underlying cryptosystem.
- A successful watermarking technique is demonstrated, enabling encrypted information embedding.
Conclusions:
- The new protocol offers a significant improvement in efficiency for homomorphic fingerprinting.
- It provides enhanced security for both buyers and merchants in digital transactions.