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from cryptography.fernet import Fernet

correct_master = "Master"
while True:
    user_input_password = input("Master password: ")
    if user_input_password == correct_master:
    while True:
        key = Fernet.generate_key()
        f = Fernet(key)
        user_input = input('What would you like to do? Type "add" to add a account, type "see" to see the accounts and type "q" to quit. ').lower()
        if user_input == "add":
            with open("passwords.txt", "a") as wf:
                user_input1 = input("Account: ")
                user_input2 = input("Password: ")
                token1 = f.encrypt(user_input1.encode()).decode()
                token2 = f.encrypt(user_input2.encode()).decode()
                wf.write(f"Account: {token1}")
                wf.write("\n")
                wf.write(f"Password: {token2}")
                wf.write("\n")
                wf.write("\n")
        elif user_input == "see":
            with open("passwords.txt", "r") as rf:
                content = rf.readlines()
                if len(content) !=0:
                    for line in content:
                        content0 = line.rstrip()
                        content1 = content0.split(": ")
                        useful = content1[1]
                        useful1 = f.decrypt(useful.encode()).decode() # The error
                        print(useful1)
                    else:
                        pass

        elif user_input == "q":
            print("bye", end="")
            quit()
        else:
            print("I don't understand. Do you want to add/see/q? ")

else:
    print("Wrong master password")

它不会让我使用 Fernet 解密。错误：签名与摘要不匹配。后跟一个 InvalidToken。有什么解决办法吗？

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