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Here's something similar but completely different... A 'one-way' cryptographic hash function which is regressible when combined with the function's parsed trapdoor index. That is to say, the hash function is the file and the trapdoor table file is the key! The trapdoor table generated is approximately 60% larger than the original file but eminently ...


You can build a gigantic, enormous tree that has capacity for up to $2^{80}$ one-time signatures (say). Then, each time you want to sign something, you randomly pick a 80-bit value and use that to select which of the $2^{80}$ subtrees to use to sign the message. As long as the number of messages you intend to sign is much less than $2^{40}$ messages, a ...

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