文章目录

一、halo

二、答题步骤

1.base64和异或

总结

一、halo

题目链接：https://adworld.xctf.org.cn/task/task_list?type=misc&number=1&grade=1&page=4

二、答题步骤

1.base64和异或

import string

from base64 import *

b=b64decode("aWdxNDs1NDFSOzFpa1I1MWliT08w")

data=list(b)

for k in range(0,200):

   key=""

   for i in range(len(data)):

       key+=chr(ord(data[i])^k)

   print (key)

igq4;541R;1ikR51ibOO0

hfp5:450S:0hjS40hcNN1

kes69763P93kiP73k`MM2

jdr78672Q82jhQ62jaLL3

mcu0?105V?5moV15mfKK4

lbt1>014W>4lnW04lgJJ5

oaw2=327T=7omT37odII6

n`v3<236U<6nlU26neHH7

aoy<3=<9Z39acZ=9ajGG8

`nx=2<=8[28`b[<8`kFF9

cm{>1?>;X1;caX?;chEE:

blz?0>?:Y0:b`Y>:biDD;

ek}8798=^7=eg^9=enCC<

dj|9689<_6<df_8<doBB=

gi:5;:?\5?ge\;?glAA>

fh~;4:;>]4>fd]:>fm@@?

ywa$+%$!B+!y{B%!yr__  

xv`%*$% C* xzC$ xs^^!

{uc&)'&#@)#{y@'#{p]]"

ztb'(&'"A("zxA&"zq\\#

}se /! %F/%}F!%}v[[$

|rd!. !$G.$|~G $|wZZ%

qg"-#"'D-'}D#'tYY&

~pf#,"#&E,&~|E"&~uXX'

qi,#-,)J#)qsJ-)qzWW(

p~h-",-(K"(prK,(p{VV)

s}k.!/.+H!+sqH/+sxUU*

r|j/ ./*I *rpI.*ryTT+

u{m(')(-N'-uwN)-u~SS,

tzl)&(),O&,tvO(,tRR-

wyo*%+*/L%/wuL+/w|QQ.

vxn+$*+.M$.vtM*.v}PP/

IGQrIKrIBoo

HFPsHJsHCnn

KESpKIpK@mm

//等等

得到flag ：flag{jdr78672Q82jhQ62jaLL3}

总结

• 修改文件头
• crc32值爆破图像宽度