量子计算机能彻底破解基于大整数分解、离散对数等为基础的几乎所有密码体制，特别是最近，实用量子计算机逼近的脚步迫使密码学家们需要提早做好准备，着手研究不受量子计算机影响的密码体制。目前普遍认同基于格理论、基于编码理论和基于多变量等的密码体制能抵抗量子攻击，称它们为后量子密码，因而密码领域已经进入了后量子密码时代。. 本项目主要研究基于编码的公钥密码的设计和分析，是后量子密码研究的热点之一，跟踪基于编码的NIST后量子密码征集算法进展；针对部分征集算法，研究提出新的密码分析方法；提出一种新型的基于编码的困难问题，设计两类基于这个困难问题的新型的密钥交换方案；改进秩距离下的经典和量子的信息集合译码算法，因此本课题具有重要的应用价值和学术价值。

Almost all cryptosystems based on the hardness of factoring or discrete logarithm will be broken with a quantum computer. Recently, approaching advent of practical quantum computers force researchers in cryptography community to prepare for it and need to study quantum-resistant cryptosystems. At present, the cryptosystems based on lattices, codes or multivariate polynomials are thought to be quantum tolerant and so are called post-quantum cryptosystems. So a new epoch of post-quantum cryptography is coming.. In this project we mainly study the design and cryptanalysis of code-based cryptosystems, which is one of hot topics in post-quantum cryptography. We will keep track of code-based candidates for the NIST post-quantum call and give new attacks on some candidates. We will propose a new code-based hard assumption and construct two type of new key exchange schemes on it. In addition. we will improve the classic and quantum information set decoding algorithm under rank metric. This project will provide the more foundation for post-quantum cryptography and we hope to achieve the advanced level for code-based cryptography.