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I would probably translate «stream cipher» as «потоковый шифр», от слова «поток», но на wikipedia статья почему-то называется «поточный шифр», хотя в содержании часто встречается словосочетание «потоковые шифры».

What's the deal here?

As far as Google goes:

  • потоковый шифр — 167.000

  • поточный шифр — 53.800

However, an exact search is exactly the opposite:

  • "поточный шифр" — 26.000

  • "потоковый шифр" — 11.600

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    Two adjectives can be formed from the word поток, потоковый and поточный, both of them are correct, use any of them.
    – Yellow Sky
    Commented Dec 10, 2013 at 20:45
  • @YellowSky, well, it is not the simple, it worth to mention that, while "потоковый/поточный шифр" are interchangeable, phrases like "потоковое видео", "потоковое вещание" are used tenfold more frequent that "поточное" forms.
    – shabunc ♦
    Commented Dec 11, 2013 at 11:45
  • @shabunc - To make it simpler, I must say that nobody spoke about what adjectives can be used with "видео" and "вещание", before you did it.
    – Yellow Sky
    Commented Dec 11, 2013 at 12:05
  • @YellowSky all I'm trying to say is that "потоковое" and "поточное" are not equally and interchangeably used in general, but it depends on exact phrase. I do believe this is good to know and relevant to the question in form of comment.
    – shabunc ♦
    Commented Dec 11, 2013 at 12:33
  • @shabunc - But that's OK, I just meant that the two words can be used interchangeably when speaking about cryptography.
    – Yellow Sky
    Commented Dec 11, 2013 at 13:28

2 Answers 2

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I've checked several Russian crypto books, they use both, sometimes within the same chapter. There is no discernible difference.

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There was a word поточный in the past (поточное производство, поточная линия): see slovari.yandex.ru. And there was no word потоковый, it is a neologism, but quite popular. See this distribution from RusCorpora.

I would force using older form, but it's up to you.

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