将明文helloworld的第一个字母移动2个位置，第二个位置移动4个位置，…，第5个字母移动7个位置，然后再从密钥的头部开始循环，直到将明文hellowrold全部转换为密文

-The first letter of plaintext helloworld move two positions, the second position moving 4 positions, ..., 5, 7 position of moving letters, and then head to start the cycle from the key, until all is converted to plain text hellowrold ciphertext