How to open encrypted files in python

Opening encrypted files in Python requires: 1. Install cryptography library; 2. Import library; 3. Obtain encryption key; 4. Create Fernet object; 5. Open and read encrypted files; 6. Decrypt Data; 7. Write decrypted file.

How to use Python to open an encrypted file

In Python, opening an encrypted file involves the following steps:

1. Install the necessary libraries

To decrypt files, you need to install the cryptography library. Install using the following command:

<code>pip install cryptography</code>

2. Import the library

In your Python script, import the cryptography library:

<code class="python">import cryptography
from cryptography.fernet import Fernet</code>

3. Obtain the encryption key

The encryption key is required to decrypt the file. The key should be a byte string:

<code class="python">encryption_key = b'' # 这里填写您的加密密钥字节字符串</code>

4. Create a Fernet object

The Fernet object is used to decrypt the file:

<code class="python">fernet = Fernet(encryption_key)</code>

5. Open and read the encrypted file

<code class="python">with open('encrypted_file.txt', 'rb') as f:
    encrypted_data = f.read()</code>

6. Decrypt the data

<code class="python">decrypted_data = fernet.decrypt(encrypted_data)</code>

7. Write the decrypted file

<code class="python">with open('decrypted_file.txt', 'wb') as f:
    f.write(decrypted_data)</code>

Example:

<code class="python">import cryptography
from cryptography.fernet import Fernet

encryption_key = b'YOUR_ENCRYPTION_KEY_BYTE_STRING'
fernet = Fernet(encryption_key)

with open('encrypted_file.txt', 'rb') as f:
    encrypted_data = f.read()

decrypted_data = fernet.decrypt(encrypted_data)

with open('decrypted_file.txt', 'wb') as f:
    f.write(decrypted_data)</code>

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