crytpo 2

32.[BJDCTF 2nd]Y1nglish-y1ng 

老规矩直接爆破

BJD{pyth0n_Brut3_f0rc3_oR_quipquip_AI_Cr4cy}
把最后一个字母改成k
BJD{pyth0n_Brut3_f0rc3_oR_quipquip_AI_Cr4ck}

33.世上无难事

老规矩直接爆破
KEY IS 640E11012805F211B0AB24FF02A1ED09
flag{640E11012805F211B0AB24FF02A1ED09}

 34 rsa

35还原大师

# -*- coding: utf-8 -*-
#!/usr/bin/env python
import hashlib

#print hashlib.md5(s).hexdigest().upper()
k = 'TASC?O3RJMV?WDJKX?ZM'  
for i in range(26):
temp1 = k.replace('?',str(chr(65+i)),1)
for j in range(26):
temp2 = temp1.replace('?',chr(65+j),1)
for n in range(26):
temp3 = temp2.replace('?',chr(65+n),1)
s = hashlib.md5(temp3.encode('utf8')).hexdigest().upper()#注意大小写
if s[:4] == 'E903': #检查元素
print (s) #输出密文

运行得到flag{E9032994DABAC08080091151380478A2}