实现加密字符串技术，程序根据概率统计自动绘制一张加密表，然后对输入字符串进行加密和自动解密工作，不过为了节省时间，只能对小写字母进行加密-Technology to achieve the encrypted string, the program automatically based on probability and statistics to draw an encrypted form, and then the input string to encrypt and decrypt