It is a simple python script that can encrypt and decrypt a file using the cryptography library. It defines two functions: encrypt_file and decrypt_file. The encrypt_file function takes in the name of the file to encrypt and a key, and uses the Fernet class from the cryptography library to encrypt the data in the file. The encrypted data is then written back to the same file. The decrypt_file function works in a similar way, but it decrypts the data in the file using the provided key.
This script can be used to encrypt and decrypt any type of file. The key used for encryption and decryption should be kept secret, as anyone with access to the key can decrypt the encrypted file. The cryptography library provides strong encryption methods, so this method of encryption is considered secure.
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