第一题：（仿射变换源码略）
第二题：
第三题：（移位密码源码略）
第四题：
DEath IS JUST A PaRT oF lIFE,sOMeTHInG wERE aLL dESTInED TO dO.Lets Go!
DEath ISJUS TAPaR ToFlI FEsOM eTHInG wERE aLL dESTInED TO dO.Lets go!
解密错误，继续解密
经查找为培根解密：
DEath ISJUS TAPaR ToFlI FEsOM eTHInG wERE aLL dESTInED TOdO.Lets go!
AABBB AAAAA AAABA ABABA AABAA BAAAB ABAAA BAABA AAABA AAABA
Flag：HACKERISCC
第五题：
第六题：