With the continuous development of network technology, people's personal information, document transfer between networks, e-commerce and other aspects need to be vigorously protected, and file encryption technology will also come into being. The encryption of files is mainly implemented by encryption algorithms. There are many encryption algorithms, such as RSA, DES, MD5, etc. However, although the principle of these algorithms is simple, but the specific implementation is very complex, so this program design is the most basic method for file encryption.<br>Java language is simple, safe, portable, object-oriented, robust, multi-threaded, architecture neutral, interpretation and execution, high-performance, distributed and dynamic. Java is an excellent programming language, which is very robust in software design. Java can be used not only to develop large-scale applications, but also to develop Internet applications. Java does have the characteristics of "write once, run everywhere". Therefore, Java has become one of the most important programming languages in the network era. This program makes full use of the characteristics of Java language, aiming at the file encryption that the society pays more attention to, designs this program.<br>This program can encrypt and decrypt many kinds of files, such as TXT, word, etc. it is convenient and practical to use, with perfect functions, and can meet the needs of users for file security.<br>
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