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前言
长时间没学习了,刚刚搭建好博客,先随便写一篇记录一下。
一道misc
来源:安恒杯2月线上赛
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题目说明:
学信息安全的朋友给你发来一封邮件,是一个小程序,有两个关卡,只要你通过这两个关卡,就会收到一封邮件。
但是这封邮件对于一般人的话会当做垃圾邮件处理,但是你知道,朋友所要描述的信息就在这封垃圾邮件当中。
邮件内容是普通的信息,但是你知道绝密消息(flag)就隐藏在其中,需要一个在线的网站去解密,而这个网站使用了栅格密码。
还在等什么,开始通关吧!
第一关就遇见没见过的密文,提示貌似在公交站经常见到,说明也是用来让人看和识别的,想到盲文,解密,再md5解密,提交提示恭喜通过第一关!
这一关要用到fastcoll(快速md5 碰撞生成器),参考博客可以下载两个文件,md5值相同,下载后输入本地文件所在路径,提交,在邮件接收区显示出一封邮件,邮件内容如下:
送你一封包含flag的邮件:
Dear Professional ; Especially for you - this cutting-edge
intelligence ! If you no longer wish to receive our
publications simply reply with a Subject: of "REMOVE"
and you will immediately be removed from our club .
This mail is being sent in compliance with Senate bill
2216 , Title 9 ; Section 306 ! THIS IS NOT MULTI-LEVEL
MARKETING . Why work for somebody else when you can
become rich as few as 35 weeks . Have you ever noticed
more people than ever are surfing the web and people
will do almost anything to avoid mailing their bills
. Well, now is your chance to capitalize on this !
WE will help YOU decrease perceived waiting time by
120% & decrease perceived waiting time by 140% . You
can begin at absolutely no cost to you . But don't
believe us ! Mrs Jones of Minnesota tried us and says
"I was skeptical but it worked for me" . We assure
you that we operate within all applicable laws . Because
the Internet operates on "Internet time" you must act
now ! Sign up a friend and your friend will be rich
too . Warmest regards . Dear Cybercitizen , We know
you are interested in receiving red-hot announcement
! We will comply with all removal requests ! This mail
is being sent in compliance with Senate bill 1619 ;
Title 2 ; Section 301 . This is NOT unsolicited bulk
mail ! Why work for somebody else when you can become
rich within 53 MONTHS ! Have you ever noticed more
people than ever are surfing the web and more people
than ever are surfing the web . Well, now is your chance
to capitalize on this . We will help you use credit
cards on your website plus decrease perceived waiting
time by 150% . The best thing about our system is that
it is absolutely risk free for you ! But don't believe
us ! Mrs Simpson of Washington tried us and says "Now
I'm rich, Rich, RICH" . We assure you that we operate
within all applicable laws ! We beseech you - act now
! Sign up a friend and your friend will be rich too
. Thank-you for your serious consideration of our offer
! Dear Friend ; This letter was specially selected
to be sent to you ! If you no longer wish to receive
our publications simply reply with a Subject: of "REMOVE"
and you will immediately be removed from our mailing
list . This mail is being sent in compliance with Senate
bill 2716 , Title 2 ; Section 306 ! This is a ligitimate
business proposal . Why work for somebody else when
you can become rich inside 33 weeks . Have you ever
noticed more people than ever are surfing the web plus
more people than ever are surfing the web . Well, now
is your chance to capitalize on this ! WE will help
YOU SELL MORE and process your orders within seconds
. You can begin at absolutely no cost to you . But
don't believe us ! Mrs Jones of Kentucky tried us and
says "I was skeptical but it worked for me" ! This
offer is 100% legal ! We implore you - act now . Sign
up a friend and you'll get a discount of 50% . God
Bless .
题目信息也说了,需要栅格密码、在线解密,搜索栅格密码,在参考链接此发现一个在线解密网站Spam Mimic,解密后得flag
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