欢迎使用加解密软件")

puts("请将需要加密的文件放在D盘jiami目录下，命名为 mingwen.txt ")

　　puts("请将需要解密的文件和密钥放在D盘jiemi目录下，命名为 miwen.txt 和 miyao.txt ")

puts("注：文件长度不能超过255个字符")

　　puts("请选择：\n1.进行加密\n2.进行解密\n3.退出") -Welcome to the encryption and decryption software ")

　　puts ("Please encrypted files on D drive jiami directory named　mingwen.txt ")

puts ("Please declassified documents and key on D drive jiemi directory named as　miwen.txt　and　miyao.txt ")

　　puts ("Note: The file length can not exceed 255 characters")

puts ("Please select: \ n1. to encrypt \ n2 is to decrypt \ n3. Exit")