Lazzaro 发表于 2019-6-22 14:11:43

【2019年6月第四周打卡】慢慢猜吧 wp

已知:三段密文
jpzdinxsrsteieespdgvcf
gzivvwgiwdrvavfewzqtye
nwobmksolffytmqzszrrem
key的前段为ilove,且都为单词组成
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1. 首先猜测可能为凯撒加密,祭出替换加密在线解密神器:https://quipqiup.com/,发现怎么都不能将解出的明文凑对有意义的话;


2. 其次猜测为维吉尼亚加密,祭出维吉尼亚加密在线解密神器:https://www.dcode.fr/vigenere-cipher:
选择已知部分key破解,未知部分用 ? 标识:

key:ilove??
1 → jpzdinxsrsteieespdgvcf → believ??
2 → gzivvwgiwdrvavfewzqtye → youare??
3 → nwobmksolffytmqzszrrem → flagis??

猜测1:believe,推得:
key:iloves??
jpzdinxsrsteieespdgvcf → believe??
gzivvwgiwdrvavfewzqtye → youaren??
nwobmksolffytmqzszrrem → flagisz??

猜测2:youarenot,推得:
key:ilovestud??
jpzdinxsrsteieespdgvcf → believeyo??
gzivvwgiwdrvavfewzqtye → youarenot??
nwobmksolffytmqzszrrem → flagiszui??

猜测key:ilovestudy,推得:
key:ilovestudy??
jpzdinxsrsteieespdgvcf → believeyou??
gzivvwgiwdrvavfewzqtye → youarenotf??
nwobmksolffytmqzszrrem → flagiszuih??

猜测2:youarenotfar,推得:
key:ilovestudyre??
jpzdinxsrsteieespdgvcf → believeyouca??
gzivvwgiwdrvavfewzqtye → youarenotfar??
nwobmksolffytmqzszrrem → flagiszuihou??

studyre???
肯定是 学逆向论坛 啊

猜测key:ilovestudyreverseforum(长度刚好和密文一样长),推得:
key:ilovestudyreverseforum
jpzdinxsrsteieespdgvcf → believeyoucananalyseit
gzivvwgiwdrvavfewzqtye → youarenotfarfromsucces(还有个s呢?)
nwobmksolffytmqzszrrem → flagiszuihouyizhoudaka

得到flag

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