Now you are one step away from knowing who is that WARRIOR. The Fighter who will decide the fate of war between the 2 countries. The Pride of One and Envey of the Other... You have got the secrete file which has the crucial information to identify the fighter. But the file is encrypted with a RSA-Private key. Good news you have its corresponding public key in a file. Bad news there are 49 other keys. Whos is the Fighter.
crypto5.zip
我是在windows下在进行操作的，由于我安装了 git, 然后里面有 Git bash, 进入bash后有awk。
进入cmd,进bash
cmd> bash
用awk分出每一个key
bash-3.1$ awk ‘/BEGIN PUBLIC KEY/{n++}{print >"key" n ".txt" }‘ all_keys.txt
然后一个perl脚本：
for($i=1;$i<50;$i++){
system("openssl rsautl -inkey key$i.txt -pubin -in warrior.txt >> outx.txt");
}
perl脚本后，打开 outx.txt 文件，得到：
This fighter is a designation for two separate, heavily upgraded derivatives of the Su-35 ‘Flanker‘ jet plane. They are single-seaters designed by Sukhoi(KnAAPO).
Google:Sukhoi(KnAAPO) Fighter, 得到 flag: Sukhoi Su-35
nullcon HackIM 2016 -- Crypto Question 5
原文：http://www.cnblogs.com/Christmas/p/5176600.html