IIIT/test.py at main · bitmap4/IIIT · GitHub

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# a = 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# valid = []
# for j in range(len(a)):
#     chars = ""
#     vowel = False
#     s = 0
#     for k in a[j]:
#         if k.isalpha():
#             chars += k
#         if k.isdigit():
#             s += int(k)
#         if k in "AEIOU":
#             vowel = True
#     conds = [(s%2==0 if vowel else s%2==1) if s<10 else True,
#             len(chars) == 3,
#             len(a[j]) == 7,
#             (ord(chars[0]) - ord(chars[1])) in [6, -6, 12, -12],
#             (ord(chars[1]) - ord(chars[2])) in [6, -6, 12, -12],
#             (ord(chars[2]) - ord(chars[0])) in [6, -6, 12, -12]]
#     if all(conds):
#         valid.append(a[j])
#     chars = ""
# print(valid)

# # a = ['480U5IO', '719NT9H', '89K19QW', '0914NZT', '46CO41I', '49S10YM', 'MG6789S', '6O44I9C', 'G0M483A', '2GS4M42', 'G5M14S8', '067HNB5', '852N7HT']
# # rem = ['2GS4M42', 'J215PD0', '719NT9H', '480U5IO', '89K19QW']
# # for i in rem:
# #     if i in a: a.remove(i)
# # print(a)

import requests
import base64

auth = "WjF3WFJCRlpXNVdlSkVwcVVCWVJtdG1CZ2VyaWhGNzhLQnhqV1dKcGxFL1FSRzNlTXBKbjU2YnRwVFBNNjA5eUdpNFVzejcwTFhVeWsxK1krVjI2QXBCb3FWSHNiYXYzYkhRaHpQVkRRbERyckNPcFB2RHRBTVJ1RWRjQmxxTXo="
# convert the base64 string to bits
auth = base64.b64decode(auth).decode('utf-8')
bits=[]
for char in auth:
    binary_representation = format(ord(char), '08b')
    for bit in binary_representation:
        bits.append(int(bit))

def back_to_base64(bits):
    # group bits by 8
    grouped_bits = [bits[n:n+8] for n in range(0, len(bits), 8)]
    # convert each group of bits back to a character
    chars = [chr(int(''.join(map(str, byte)), 2)) for byte in grouped_bits]
    # join the characters back into a string
    str_from_bits = ''.join(chars)

    base64_str = base64.b64encode(str_from_bits.encode()).decode()
    return base64_str

# flip each bit one by one
for i in range(len(bits)):
    temp = bits.copy()
    temp[i] = temp[i] ^ 1
    # convert temp back to base 64
    x = back_to_base64(temp)
    # send a get req to http://mercury.picoctf.net:43275/ with cookie auth_name=x
    cookies = {"auth_name": x}
    r = requests.get("http://mercury.picoctf.net:43275/", cookies=cookies)
    t = r.text
    if "picoctf{" in t.lower():
        print(t)
        break