RSA加密算法，界面操作，可以很方便的对文件的内容进行加密，而且为了能加密更长的内容，算法中采用了分段加密的手段。其算法步骤如下：1.　　读取公钥e和n，作加密之用。 2.　　从DecText中读取一大段明文，转化成明文字节数组Byte[]。 3.　　再把Byte[]分成若干小段明文字节数组sectByte[]。 4.　　使用e和n对所有的sectByte[]进行加密，并合成一大段密文,添加到EncText。 5.　　读取下一大段明文，若明文为空，完成加密；否则转2-RSA encryption algorithm, interface operation, it is convenient to the contents of the documents for encryption, but in order to longer content encryption algorithm used in the sub-encryption tools. The algorithm steps are as follows : 1. Read public key e and n, for encryption purposes. 2. DecText from reading a big specifically, into an express byte array Byte []. 3. Byte [] then divided into pieces expressly sectByte byte [] array. 4. The use of e and n of all sectByte [] encryption and synthesis of a large dense text to be added EncText. 5. The next major reading of the express, if expressly for the space, complete encryption; Otherwise turn 2