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  2. [Comment removed by author]

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      I think one of the replies is also really informative:

      To abuse this property you need to get the state of the hash to match a state you get when running the decryption of the blockcipher underlying the compression function. Finding such a match requires a meet-in-the-middle attack with cost $2^{n/2}$ and thus isn’t cheaper than finding a collision.

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      I feel like an “inaccurate” tag would be in order.

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        It feels slightly odd that there’s an “incorrect” downvote for posts, but no “incorrect” flag for articles.

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          I’d add it if it existed :D