Based on the investigation to the principle and specifications of AES, an effective implementation of AES block cipher is completed and the document encryption and decryption is also completed by using Cipher Block Chaining (CBC).

• 在研究分析了AES加密原理的基础上着重说明了AES算法实现的具体步骤,并用C语言完整地实现了AES算法,并利用密文分组链接(CBC)方式将其用于对文件的加密/解密(密钥长度可选)。