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A comment on Ask HN: Best way to block an EC2-hosted scraper?. Parent comment

Re:Ask HN: Best way to block an EC2-hosted scraper? by amccloud on Sunday January 09, 2011 @07:37PM (#2086960)
Not true. See http://en.wikipedia.org/wiki/Birthday_problem
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Re:Ask HN: Best way to block an EC2-hosted scraper? by wnoise on Sunday January 09, 2011 @09:19PM (#2087178)
The birthday problem basically just cuts the number of bits in half. For SHA1 this changes from a chosen collision at absurd odds to a random collision at merely ridiculous odds.
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