WebKit committed the 2 "shattered" PDFs having the same SHA1 chksum to their GIT repo, screwing their SVN export https://bugs.webkit.org/show_bug.cgi?id=168774#c23 …
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oh, their collision only works in one position in the file. Or the same alignment in any block?
In general MD collisions like this one can be appended to, but not prepended to.
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This is because initial state matters. A collision independent of that would indicate a huge weakness.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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