Update stream-ciphers.rst #385
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| This scheme is called :term:`ECB mode` (Electronic Code Book Mode), and it is | ||
| one of the many ways that block ciphers can be used to construct stream | ||
| The scheme is known as :term:`ECB mode` (Electronic Code Book Mode). It is | ||
| one of several methods in which block ciphers can construct stream |
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I appreciate removing a passive here, but it seems kind of strange to think of a mathematical algorithm as "constructing" anything.
| sufficiently large that they don't pose a practical problem. | ||
| stream of bits. Ideally, the stream should be as long as we like, but | ||
| real-world :term:`stream cipher`\s have limits. Though the stream is | ||
| sufficiently large that it does not pose practical problems. |
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I think this changes the meaning of the sentence. I'm not saying "it'd be great if we could get a stream of the appropriate size" because appropriate size is specific to the application of a stream cipher, i.e. the specific message you're encrypting. I'm saying that in the abstract, to evaluate a stream cipher, you'd ideally want it to produce unbounded streams. In practice they're not quite unbounded, but they're typically long enough.
| Then, we'll demonstrate that attackers can often decrypt messages | ||
| The many flaws of :term:`ECB mode` are illustrated in the following two attack examples. First, | ||
| by visually inspecting an encrypted image, we exploit the fact that repeating | ||
| plaintext blocks results in repeating ciphertext blocks. |
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gramnmar: blocks are plural, so, result?
| repeating ciphertext blocks, by visually inspecting an encrypted image. | ||
| Then, we'll demonstrate that attackers can often decrypt messages | ||
| The many flaws of :term:`ECB mode` are illustrated in the following two attack examples. First, | ||
| by visually inspecting an encrypted image, we exploit the fact that repeating |
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This introduces passive voice but also changes the meaning of the sentence, I think, and it makes less sense now. You can exploit the fact that repeating plaintext blocks result in repeating ciphertext blocks through visual inspection. But it seems very strange to reverse that and say visual inspection directly you're exploiting anything.
I think this needs rephrasing.
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