Block ciphers

Since the nature of block ciphers is to encrypt blocks of data, every implementation has to have text_size and key_size among its attributes. The design choice is to not enforce them, nevertheless they are strictly recommended.

Note that every cipher is implemented as a frozen dataclass. The design choice is to have an automatic method to identify the instance. This is achieved caching in the best effort way all properties that can be derived by the attributes which are mandatory.

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