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How to generate an arbitrary file matching a given MD5 hash?

In general, no. For MD5, we know a cheap way of finding collisions, i.e. finding two files F1 and F2 such that F1≠F2 MD5(F1) = MD5(F2). Even better, we know how to find collisions with a known prefix: ...
Gilles 'SO- stop being evil''s user avatar
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How to generate an arbitrary file matching a given MD5 hash?

Is this possible? This is known as the 'second preimage' problem. Alas, there are no known methods to do it against MD5 that are more efficient than brute force (which, at an expected $2^{128}$ MD5 ...
poncho's user avatar
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