Python UnicodeDecodeError：“utf-8”编解码器无法解码字节

Question

首先，对不起，关于这个问题有很多问题，我淹没在很多答案中，但我仍然不明白，因为我的代码只要我写入文件就可以工作（？）

那么，为什么会这样：

# encrypt and write to file    
    data_to_encrypt = "mytext" 
    data = data_to_encrypt.encode('utf-8')
    ciphered_bytes = cipher_encrypt.encrypt(data)
    ciphered_data = ciphered_bytes
    print(ciphered_data)

    with open(fileConfigBIN, "wb") as binary_file:
        binary_file.write(ciphered_data)

# read the file and decrypt
    with open(fileConfigBIN, "rb") as binary_file:
        data1 = binary_file.read()
        print(data1)
        deciphered_bytes = cipher_decrypt.decrypt(data1)
        decrypted_data = deciphered_bytes.decode('utf-8')
        print(decrypted_data)

输出：

b'\xa0U\xee\xda\xa8R'

b'\xa0U\xee\xda\xa8R'

我的文本

但只是通过注释写入文件（文件仍然存在相同的信息）：

    #data_to_encrypt = "mytext" 
    #data = data_to_encrypt.encode('utf-8')
    #ciphered_bytes = cipher_encrypt.encrypt(data)
    #ciphered_data = ciphered_bytes
    #print(ciphered_data)

    #with open(fileConfigBIN, "wb") as binary_file:
    #    binary_file.write(ciphered_data)

    with open(fileConfigBIN, "rb") as binary_file:
        data1 = binary_file.read()
        print(data1)
        deciphered_bytes = cipher_decrypt.decrypt(data1)
        decrypted_data = deciphered_bytes.decode('utf-8')
        print(decrypted_data)

我明白了：

b'\xa0U\xee\xda\xa8R'

Tkinter 回调异常 回溯（最近一次通话最后）： 调用中的文件“C:\Users.......\Python37-32\lib\tkinter__init__.py”，第 1705 行 返回 self.func(*args) AbrirConfig 中的文件“C:\Users\Fabio\source......”，第 141 行 decrypted_data = deciphered_bytes.decode('utf-8') UnicodeDecodeError：“utf-8”编解码器无法解码位置 1 的字节 0xdd：无效的继续字节

读取的代码使用的是和注释部分相同的文件保存！

我尝试保存并读取 'latin-1'、'ISO-8859-1' 等。它没有给出错误，但只返回奇怪的字符

使用 Python 3.7

提前致谢！

编辑：

完整的工作最小代码：

from Crypto.Cipher import AES

fileConfigBIN = "data.dat"

key = b'\x16\x18\xed\x1c^\xaaGN\rl\xc0]\xf0t=\xd0\xdc]t\xaf\xb2\x12,\xe6\xfc\xd6\x11-\x10\xb4\xb1\x0b'
cipher_encrypt = AES.new(key, AES.MODE_CFB)
iv = cipher_encrypt.iv
cipher_decrypt = AES.new(key, AES.MODE_CFB, iv=iv)

def Encrypt():
    data_to_encrypt = "MyTextToEncrypt" 
    data = data_to_encrypt.encode('utf-8')
    ciphered_bytes = cipher_encrypt.encrypt(data)
    ciphered_data = ciphered_bytes

    with open(fileConfigBIN, "wb") as binary_file:
        binary_file.write(ciphered_data)
        print("CRYPTED DATA SAVED TO FILE: ", str(ciphered_data))

def Decrypt():
    with open(fileConfigBIN, "rb") as binary_file:
        data1 = binary_file.read()
        print("DATA READ FROM FILE: ", data1)
        deciphered_bytes = cipher_decrypt.decrypt(data1)
        decrypted_data = deciphered_bytes.decode('utf-8')
        print("DECRYPTED DATA: ", decrypted_data)

Encrypt() #comment this function to show the problem
print('---------------------')
Decrypt()

伙计们，我做到了！感谢@Hoenie 洞察力，对于每次加密，我都会存储 iv 值并在需要时使用它来解密。如果碰巧需要再次加密，它会保存另一个iv值等等......谢谢谢谢！

Answer 1

好的，这似乎与编码/解码无关。 您需要创建一个新的密码对象，因为它只能使用一次。

def Decrypt():
    cipher_decrypt = AES.new(key, AES.MODE_CFB, iv=iv)   # <-- add this
    with open(fileConfigBIN, "rb") as binary_file:
        data1 = binary_file.read()
        print("DATA READ FROM FILE: ", data1)
        deciphered_bytes = cipher_decrypt.decrypt(data1)
        decrypted_data = deciphered_bytes.decode('utf-8')
        print("DECRYPTED DATA: ", decrypted_data)

在源码中：GitHub

密码对象是有状态的：一旦你解密了一条消息 你不能用相同的方式解密（或加密）另一条消息 对象。

感谢：https://stackoverflow.com/a/54082879/7547749