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I checked out TripleDES. It’s block size is of 64 bits.
Is there any algorithm for 8 bits block size?
Thanks
EDIT : I intend not to use this for perfect protection, but for a just-in-case situation where one who sees the code should not find the plaintext. So 8 bit is kinda okay for me.
RSA with 8-bit key 🙂
Seriously though, the block-based cyphers are stateless – the ciphertext of a block depends only on the cleartext of the block, not on the previous blocks (otherwise it would be a stream cypher). A block cypher that acts on 8-bit blocks can be brute-forced easily, so there’s no point.