CTF中crypto的还原大师问题就是md5的爆破python爆破脚本: import hashlib#print hashlib.md5(s).hexdigest().upper()k = 'TASC?O3RJMV?WDJKX?ZM' #要还原的明文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}