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A nonce ensures that the same plaintext will always be mapped to different ciphertexts using the same key. Schemes requiring a nonce should always get a nonce, even for file-encryption you can't guarantee that your users won't encrypt the very same file twice, for reasons only known to them. Now to answer your questions: Authenticated encryption (AE) is ...


It seems you want some sort of anonymization, and you already jump to a conclusion with encrypting symbols. Maybe you should step away of that for a moment, and ask yourself what your actual goal is. Encryption is useful, if you want to be able to reverse that process. If you don't hashing is a better choice in general. Your set is small enough that you ...

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