使用维吉尼亚密码解密：
对附录1中密文进行解密(密钥为decipher)： Dear doctor: I am a middle school student of sixteen. I have a problem and I am writing to ask you for some advice. The problem is my weight. I am just 1.57 metres high but my weight is 71 kilos. Many students often make fun of me. Boys were unfriendly to me. That makes me feel unhappy. I am now worried about my weight. Although I am a bit too fat. I feel rather well. I enjoy my meals. I love eating meat very much. And I like sweet food too. I often have sugar with tea milk and even hot water. Now I am getting fatter and fatter. In the past two months I have put on 5 kilos. So I am becoming more and more worried about this problem but I do not know how to lose weight quickly. Could you tell me a way to lose weight ? Please help me dear doctor! I hope to hear from you as soon as possible. With best wishes! Mary 10.11.2003
3. 密文是：ILS LTAGZ NHTRWSEAIR U DDENPE 分析讨论： 实验教师评语 签名： 日期： 成绩
