>From the title it sounds like you're talking about my 2007 proposal: http://www.lshift.net/blog/2007/11/10/squaring-zookos-triangle http://www.lshift.net/blog/2007/11/21/squaring-zookos-triangle-part-two
This uses key stretching to increase the work of generating a colliding identifier from 2^64 to 2^88 steps.
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