Why encryption should be done using a publicly known algorithm

Question

Why encryption should be done using a publicly known algorithm

and the secret part be a string that the algorighm operates on that? what if I use a very simple algorighm which I made myself, no body knows, and there is no secret string needed to identify myself(I would implement such thing in my algorighm also if I want).
such encryption never would be cracked.

#english #programming

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03.07.2018