制作一个RSA的加解工具的过程：
1、随机搜索大素数，随机生成公钥和私钥；
2、用公钥对任意长度的明文加密；
3、用私钥对密文解密；
4、界面简洁、交互操作性强。
5、（可选）实现对汉字的加解密，把加密结果存放在文本文档(The design process of making a RSA encryption tool:
1. The large prime number is searched randomly and the public key and the private key are randomly generated.
2, use public key to encrypt any length of plaintext.
3. Decrypt the ciphertext with the private key;
4. The interface is concise and the interoperability is strong.
5. (optional) to decrypt and decrypt the Chinese character, and store the encrypted results in the text document)