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Fernet Cipher

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Fernet Cipher is a symmetric encryption method which makes sure that the message encrypted cannot be manipulated/read without the key. It uses URL safe encoding for the keys. Fernet uses 128-bit AES in CBC mode and PKCS7 padding, with HMAC using SHA256 for authentication.

The IV is created from os.random().

Key: The key must be 32 bytes (256 bits) encoded with Base64.

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