Solution:
Extract the file and we could find a txt which contains a string like base64.Decode it:
import base64 inpt = open("nvshen.txt") out = open("a.out","w") u = inpt.read() v = base64.b64decode(u) out.write(v)
then we found it is a picture. search by image on google and then we could found the flag :爱新觉罗启星
xctf --Hctf2014 Quals write up
原文：http://www.cnblogs.com/philippica/p/5185973.html