随着计算机网络和信息通信技术的发展，网络信息安全已经成为不可忽视的领域，密码技术则是保护信息安 全的核心技术。维吉尼亚（Vigenere）密码算法是古典加密算法中的最典型的算法之一,是在单一的“凯撒密码”基础上扩充出 的多表密码。本文介绍了维吉尼亚加密算法的原理及实现方法。

With the development of computer network and information communication technology, network information security has become a field that should be paid attention to, and its core technology is ciphergraph. Vigenere algorithm is one of the most typical classical encryption algorithms, which is a multi-table password expanded from the single "Caesar Cipher ".This paper introduces the principle and realization method of Vigenere encryption algorithm.