In this paper, we present the quantum implementation and analysis of the recently proposed block cipher, DEFAULT. This cipher consists of two components, namely DEFAULT-LAYER and DEFAULT-CORE. Two instances of DEFAULT-LAYER are used before and after DEFAULT-CORE (in the so-called ‘sandwich construction’). We discuss the various choices made to keep the cost for the basic quantum circuit and that of the Grover’s oracle search, and compare it with the levels of quantum security specified by the United States’ National Institute of Standards and Technology (NIST). All in all, our work fits in the research trend of finding the possible quantum vulnerability of symmetric key ciphers.

在本文中，我们介绍了最近提出的分组密码 DEFAULT 的量子实现和分析。该密码由两个组件组成，即 DEFAULT-LAYER 和 DEFAULT-CORE。DEFAULT-LAYER 的两个实例在 DEFAULT-CORE 之前和之后使用（在所谓的“三明治结构”中）。我们讨论了为保持基本量子电路和格罗弗预言搜索的成本而做出的各种选择，并将其与美国国家标准与技术研究所 (NIST) 规定的量子安全级别进行比较。总而言之，我们的工作符合寻找对称密钥密码可能的量子脆弱性的研究趋势。