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I think RC4 is being treated unfairly.

If I post a gigabyte-large file and the only thing you know about it is that it's been encrypted with RC4-drop777, will you be able to crack it?

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Is RC4 at least fast to enc/dec?

Of course it is fast. People even implemented it in QBasic 30 years ago.

I mean rather in practice as AES for example runs on chips (https://en.m.wikipedia.org/wiki/AES_instruction_set ).

But RC4 is quite fast even on something like 6502 or Z80.

Besides, I wouldn't rely on complex and probably buggy hardware to perform such tasks these days.