Comment by NewsaHackO

I thought it was a padding scheme, where you use a moving mask to obscure the plaintext, then encrypt that. Since it's being XOR'ed, adjacent characters will not have the same encryption values anymore. Sort of like using CBC instead of ECB for block ciphers. However, because this article is about the maths with RSA itself, he probably correctly thought it was not relevant to what he was writing about and would just unnecessarily complicate things.