Ismail Kizir wrote:
> The essential logic of the algorithm is using the key as a "jump
> table" which is dynamically updated with every "jump" we make.

Sounds like RC4.  Please tell us how you are avoiding the weaknesses
that make RC4 insecure.

> Briefly, to decypher a ciphertext, a cracker needs to find out the
> key, and, to find out the key, cracker needs to find out the
> plaintext, because the key is dynamically updated according the
> plaintext during encryption process: Impossible!

That problem has been solved for a long time:
https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation


Anyway, I tried to modify your program to encrypt a large message
consisting only of zero bytes.  The result did not look random.


Regards,
Clemens
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