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...wouldn't key still get repeated every few hours or so - i.e. you come to the end of the PRG(K)... This is where you are mistaken. Modern cryptographic PRGs simply do no repeat within any conceivable time frame. That is, starting from a seed, a well-constructed PRG (and this is true even when they are not so well constructed, like RC4) will simply ...


2

By far, RC4 is the most popular stream cipher that's been around for 10+ years. ChaCha20 has just turned 10, and is now becoming popular, but was essentially unheard of 10 years ago.



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