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某比赛wp

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某比赛wp.md

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Od调试下断后看到，将已知字符串异或后跟输入的比较，截取部分，在写代码

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#!/usr/bin/env python
# coding=utf-8

String = "NbWG9;2"
String2 = "JPFjXj"[::-1]
print(String2)

flag= ""
for i in range(len(String)):
    temp = chr(ord(String[i])^0x7)
    flag += temp

for i in range(len(String2)):
    temp = chr(ord(String2[i])^0x33)
    flag += temp
print flag

#flag:{NSCTF_md50b7dfc60761e798328a0d9793f96d4f7}

misc

https://blog.csdn.net/Sallyyym/article/details/89391087

原题

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#!/usr/bin/env python
# coding=utf-8
def affine(a, b):
    pwd_dic = {}
    for i in range(26):
        pwd[chr(((a*i+b)%26)+97)] = chr(i+97)
    return pwd
if __name__ == '__main__':
    pwd= {}
    pwd1 = "rgydmllakzgc"
    plain = []
    pwd = affine(5, 12)
    for i in pwd1:
        plain.append(pwd[i])
    print ("Flag:"+"".join(plain))

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BeSTAffiKnEY

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6d5a256aeb1b5d47dd3b40dec6e7c885
加上flag{6d5a256aeb1b5d47dd3b40dec6e7c885}

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