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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 ...


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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