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:
import cryptography from cryptography.fernet import Fernet
3. Obtain the encryption key
The encryption key is required to decrypt the file. The key should be a byte string:
encryption_key = b'' # 这里填写您的加密密钥字节字符串
4. Create a Fernet object
The Fernet object is used to decrypt the file:
fernet = Fernet(encryption_key)
5. Open and read the encrypted file
with open('encrypted_file.txt', 'rb') as f: encrypted_data = f.read()
6. Decrypt the data
decrypted_data = fernet.decrypt(encrypted_data)
7. Write the decrypted file
with open('decrypted_file.txt', 'wb') as f: f.write(decrypted_data)
Example:
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)
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