Biometrics, with its uniqueness to every individual, has been adapted as a security authentication feature by many institutions. These biometric data are processed into templates that are saved on databases, and a central authority centralizes and controls these databases. This form of storing biometric data, or in our case fingerprint template, is asymmetric and prone to three main security attacks, such as fake template input, template modification or deletion, and channel interception by a malicious attacker. In this paper, we secure an encrypted fingerprint template by a symmetric peer-to-peer network and symmetric encryption. The fingerprint is encrypted by the symmetric key algorithm: Advanced Encryption Standard (AES) algorithm and then is uploaded to a symmetrically distributed storage system, the InterPlanetary File system (IPFS). The hash of the templated is stored in a decentralized blockchain. The slow transaction speed of the blockchain has limited its use in real-life applications, such as large file storage, hence, the merge with IPFS to store just the hashes of large files. The encrypted template is uploaded to the IPFS, and its returned digest is stored on the Ethereum network. The implementation of IPFS prevents storing the raw state of the fingerprint template on the Ethereum network in order to reduce cost and also prevent identity theft. This procedure is an improvement of previous systems. By adopting the method of template hashing, the proposed system is cost-effective and efficient. The experimental results depict that the proposed system secures the fingerprint template by encryption, hashing, and decentralization.

中文翻译：

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使用区块链和分布式存储系统保护指纹模板

生物识别技术对每个人都是独一无二的，已被许多机构用作安全认证功能。这些生物特征数据被处理成保存在数据库中的模板，中央机构对这些数据库进行集中和控制。这种存储生物特征数据的形式，或在我们的例子中的指纹模板，是不对称的，容易受到三种主要的安全攻击，例如伪造模板输入、模板修改或删除以及恶意攻击者的通道拦截。在本文中，我们通过对称对等网络和对称加密来保护加密指纹模板。指纹通过对称密钥算法：高级加密标准（AES）算法加密，然后上传到对称分布的存储系统——星际文件系统（IPFS）。模板的哈希存储在分散的区块链中。区块链的缓慢交易速度限制了它在现实生活中的应用，例如大文件存储，因此，与 IPFS 合并以仅存储大文件的哈希值。加密后的模板上传到 IPFS，其返回的摘要存储在以太坊网络上。IPFS 的实施防止将指纹模板的原始状态存储在以太坊网络上，以降低成本并防止身份盗用。该程序是对以前系统的改进。通过采用模板散列的方法，所提出的系统具有成本效益和效率。实验结果表明，所提出的系统通过加密、散列和分散来保护指纹模板。