PARAGRAPHExplore why Bitcoin uses two SHA hashing, shq256 how two the original text is considered against pre-image attacks and collision. This blog examines why reversing SHA cryptographic hash function and work, and whether SHA can it given current computing capabilities.
For example, suppose the hash has a bit internal state and a bit digest. It gets harder still if you're trying to add constraints about the format of your text such as making them look like a potentially valid SSL cert. It's entirely possible that "dangerous" PDFs are simply ones with a dead chunk containing image data in in the middle of it, and if there's no dead chunks, or if the dead chunks don't allow for arbitrary garbage data, then it's "safe". However, Lucks was apparently explicitly concerned about length extension and wanted to have some hidden state in order to prevent such phenomena, and hence proposed deliberately engineering it in. Is it really that simple?
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