From: bob hope <lists@...>
Date: 2012-08-01T07:03:07+09:00
Subject: working with large binary strings?

I need to work with multiple large binary strings, and to do XOR
operations on their 'rows'. This is all fine, but I am having a slow
time to get binary representation in this fashion:

a = SecureRandom.random_bytes(250_000).unpack("B*")[0].to_i.to_s(2)

I know there must be a quick way to do it, because a =
SecureRandom.random_bytes(250_000) is very fast, so I don't know why it
would be slow to convert that into a bit string of 1's and 0's that will
allow me to manipulate it on a bit by bit basis. Is there a faster way
to do this? Generating that string takes about one second, but then
getting its binary form as 1's and 0's takes a few minutes.

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