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Can you please tell me what should be the quality of an encryption function using a key size of 256 bits... I realized from my previous question that a simple XOR of plaintext (256 bits) with a suitable key of same size is totally unsafe, as the key can be totally recovered by a simple known plaintext attack. I was trying to implement my own cipher as a project for fun ! Thankyou everyone in advance... !

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Block cipher design is hard.

In my opinion, the most accurate description of a quality would be "withstand public cryptanalysis for a couple of years, while there is enough public interest".

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