Abstract
In recent decades, log system management has been widely studied for data security management. System abnormalities or illegal operations can be found in time by analyzing the log and provide evidence for intrusions. In order to ensure the integrity of the log in the current system, many researchers have designed it based on blockchain. However, the emerging blockchain is facing significant security challenges with the increment of quantum computers. An attacker equipped with a quantum computer can extract the user's private key from the public key to generate a forged signature, destroy the structure of the blockchain, and threaten the security of the log system. Thus, blind signature on the lattice in post-quantum blockchain brings new security features for log systems. In our paper, to address these, firstly, we propose a novel log system based on post-quantum blockchain that can resist quantum computing attacks. Secondly, we utilize a post-quantum blind signature on the lattice to ensure both security and blindness of log system, which makes the privacy of log information to a large extent. Lastly, we enhance the security level of lattice-based blind signature under the random oracle model, and the signature size grows slowly compared with others. We also implement our protocol and conduct an extensive analysis to prove the ideas. The results show that our scheme signature size edges up subtly compared with others with the improvement of security level.
Highlights
Log system is a significant implement for a complete information system, which provides log collection, log storage, log query, etc
To address these, firstly, we propose a novel log system based on post-quantum blockchain that can resist quantum computing attacks
For the issue that signers can threaten the privacy of log information, we proposed a novel lattice-based blind signature scheme enhanced the security level to complete the signature operation in this system, which blindness protects the privacy of log information, and one-more unforgeability keeps the validity of the blind signature
Summary
Log system is a significant implement for a complete information system, which provides log collection, log storage, log query, etc. The importance of security is profound in terms of a more robust demand for privacy protection and identity authentication In this way, research on blockchain security should consider traditional cryptography and other potential threats, such as quantum attacks [11]. Blind signature based on lattice designed by Rückert [22] It has been getting more attention since the emergence of digital cash schemes on the blockchain, which Chaum initially introduced to make signers sign the information without seeing the plaintext. For the issue that signers can threaten the privacy of log information, we proposed a novel lattice-based blind signature scheme enhanced the security level to complete the signature operation in this system, which blindness protects the privacy of log information, and one-more unforgeability keeps the validity of the blind signature. We evaluate the comprehensive performance and prove that our scheme has a smaller signature length compared with similar schemes
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