ChaCha20: https://github.com/kirisuna1/ChaChaChatroom

Saber: https://github.com/Przemyslaw11/Saber

The cipher.nonce is a term used in cryptographic algorithms, particularly in the context of the pycryptodome library in Python. Let's break down what a nonce is and its function:

What is a Nonce? Nonce: A "nonce" stands for "number once." It's a random or pseudo-random value that is used only once in a cryptographic communication. The main purpose of a nonce is to ensure that the same encryption key produces different ciphertexts for the same plaintext when the same key is used multiple times.

Function of cipher.nonce In the context of the pycryptodome library (and similar cryptographic libraries), cipher.nonce is used to hold the nonce value generated by the cipher object. This value is typically required to decrypt the data later.

When creating a new cipher object (for instance, using AES in EAX mode), the library automatically generates a nonce if you don't provide one explicitly.

The nonce is then stored as an attribute of the cipher object, and you can retrieve it using cipher.nonce.

Importance of Nonce Uniqueness: Ensures that even if the same plaintext is encrypted multiple times with the same key, the resulting ciphertext will be different each time.

Security: Prevents replay attacks and ensures the integrity of the encrypted data.

By using cipher.nonce, you can securely manage and store the nonce value needed for both encryption and decryption processes.

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