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<p>The application of blockchain technology to covert transmission of sensitive data effectively mitigates the risk of data mining attacks. However, to date, there remains a lack of comprehensive solutions that simultaneously support multi-recipient communication, high-capacity information transmission, and tracelessness.To address these challenges, this paper proposes a blockchain-based one-to-many traceless covert communication model for secure high-capacity information transmission. First, we extend the ECC-ElGamal algorithm to design a single-sender, multi-recipient blockchain-based covert communication paradigm, integrating smart contracts for group management. Next, we leverage off-chain IPFS storage to securely store high-capacity information and ciphertext components, retrieving them via Content Identifiers (CID). To ensure the covert transmission of CID, we introduce a null transaction mechanism, preventing CID from being permanently recorded on the blockchain.Finally, we evaluate the model’s transmission efficiency and covertness properties through both theoretical analysis and experimental validation. Experimental results demonstrate that the proposed communication paradigm significantly improves both transmission efficiency and covertness. Specifically, the model enables the broadcast of 100MB of data to 10 recipients within approximately 9.5 seconds, while the covert transmission process closely resembles normal transactions. Furthermore, the crucial CID disappears from the blockchain within approximately 5 minutes, underscoring the model’s high efficiency and strong covertness capabilities.</p>

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A blockchain-based one-to-many traceless covert communication model for secure high-capacity information transmission

  • 期刊论文

  • 发表日期：

    2025年9月30日

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  • Wei She,
  • Jiawei Ma,
  • Kebing Xia,
  • Kong Cheng,
  • Shuhui Zhang,
  • Wei Liu,
  • Zhao Tian

摘要

The application of blockchain technology to covert transmission of sensitive data effectively mitigates the risk of data mining attacks. However, to date, there remains a lack of comprehensive solutions that simultaneously support multi-recipient communication, high-capacity information transmission, and tracelessness.To address these challenges, this paper proposes a blockchain-based one-to-many traceless covert communication model for secure high-capacity information transmission. First, we extend the ECC-ElGamal algorithm to design a single-sender, multi-recipient blockchain-based covert communication paradigm, integrating smart contracts for group management. Next, we leverage off-chain IPFS storage to securely store high-capacity information and ciphertext components, retrieving them via Content Identifiers (CID). To ensure the covert transmission of CID, we introduce a null transaction mechanism, preventing CID from being permanently recorded on the blockchain.Finally, we evaluate the model’s transmission efficiency and covertness properties through both theoretical analysis and experimental validation. Experimental results demonstrate that the proposed communication paradigm significantly improves both transmission efficiency and covertness. Specifically, the model enables the broadcast of 100MB of data to 10 recipients within approximately 9.5 seconds, while the covert transmission process closely resembles normal transactions. Furthermore, the crucial CID disappears from the blockchain within approximately 5 minutes, underscoring the model’s high efficiency and strong covertness capabilities.