Do there exist two 128-bit values that hash to each other?

Find (X,Y) such that md5(X) = Y and md5(Y) = X

can they be found without brute force?

For extra credit: Am I allowed to make up the term "md5-itive inverse identity?"

The solution set will be sparse, if not empty.

For your LOL's today, here ya go:

https://github.com/flipmcf/playground/tree/master/md5-inverse-search

Related:

MD5 Fixed Point
MD5 Hash Collisions

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