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With a hash function that is vulnerable to length extension attacks, like SHA-256, you can turn any random collision into a collision with that random string concatenated with some (partially) chosen data. In any use case where random initial data does not matter, you could use it to generate two documents which have the same hash value and thus the same ...


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Your idea seems secure, but it is more complicated than it needs to be. If you only need to know if the "secure information" in the document matches some public information (stored on an insecure computer), it is enough to calculate a preimage resistant hash of the document (e.g. SHA-256). The document needs only to be unguessable, like a 256-bit random ...



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