[*CTF 2021]GuessKey2

from random import randint
import os
from flag import flag
N=64
key=randint(0,2**N)
# print key
key=bin(key)[2:].rjust(N,‘0‘)
count=0
while True:
    p=0
    q=0
    new_key=‘‘
    zeros=[0]
    for j in range(len(key)):
        if key[j]==‘0‘:
            zeros.append(j)
    p=zeros[randint(0,len(zeros))-1]
    q=zeros[randint(0,len(zeros))-1]
    try:
        mask=int(raw_input("mask:"))
    except:
        exit(0)
    mask=bin(mask)[2:]
    if p>q:
        tmp=q
        q=p
        p=tmp
    cnt=0
    for j in range(0,N):
        if j in range(p,q+1):
            new_key+=str(int(mask[cnt])^int(key[j]))
        else:
            new_key+=key[j]
        cnt+=1
        cnt%=len(mask)
    key=new_key
    try:
        guess=int(raw_input("guess:"))
    except:
        exit(0)
    if guess==int(key,2):
        count+=1
        print ‘Nice.‘
    else:
        count=0
        print ‘Oops.‘
    if count>2:
        print flag