今日題目

解題

其實PW Crack系列都差不多，都只是改程式的問題
簡單來說，先把題目給我們的檔案都下載下來
然後進去看看python的程式

# PW 1
### THIS FUNCTION WILL NOT HELP YOU FIND THE FLAG --LT ########################
def str_xor(secret, key):
    #extend key to secret length
    new_key = key
    i = 0
    while len(new_key) < len(secret):
        new_key = new_key + key[i]
        i = (i + 1) % len(key)        
    return "".join([chr(ord(secret_c) ^ ord(new_key_c)) for (secret_c,new_key_c) in zip(secret,new_key)])
###############################################################################


flag_enc = open('level1.flag.txt.enc', 'rb').read()



def level_1_pw_check():
    user_pw = input("Please enter correct password for flag: ")
    if( user_pw == "8713"):
        print("Welcome back... your flag, user:")
        decryption = str_xor(flag_enc.decode(), user_pw)
        print(decryption)
        return
    print("That password is incorrect")



level_1_pw_check()

可以看到，密碼非常明顯吧XD

# PW 2
### THIS FUNCTION WILL NOT HELP YOU FIND THE FLAG --LT ########################
def str_xor(secret, key):
    #extend key to secret length
    new_key = key
    i = 0
    while len(new_key) < len(secret):
        new_key = new_key + key[i]
        i = (i + 1) % len(key)        
    return "".join([chr(ord(secret_c) ^ ord(new_key_c)) for (secret_c,new_key_c) in zip(secret,new_key)])
###############################################################################

flag_enc = open('level2.flag.txt.enc', 'rb').read()



def level_2_pw_check():
    print(chr(0x34) + chr(0x65) + chr(0x63) + chr(0x39))
    user_pw = input("Please enter correct password for flag: ")
    if( user_pw == chr(0x34) + chr(0x65) + chr(0x63) + chr(0x39) ):
        print("Welcome back... your flag, user:")
        decryption = str_xor(flag_enc.decode(), user_pw)
        print(decryption)
        return
    print("That password is incorrect")



level_2_pw_check()

結果，改一改程式讓他自己吐出答案或自己打上去就可以拿到Flag了喔