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What is RC4?
A stream cipher.
Old encryption algorithm, don't use it.

Infamous for "kerberoasting", among other exploits.

Is that - don't use it ... with playing cards?
A formerly-popular cipher that works better than you'd expect given its extreme simplicity--simple enough that you can encrypt and decrypt it by hand with a deck of cards.

Nowadays it's insecure though, so you should never use it.

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