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Your idea of salting the signature to prevent the collision attack doesn't work, because your salted signing operation is a deterministic mathematical function, and the random choice of salt is only made at signature time, not at verification. Your signature algorithm has to be something like this. For a document $x$ and hash function $H$: Hash the document:...


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Let's begin with what is MD5; MD5 has a 128-bit digest size, 512-bit block size Merkle–Damgård construction based hash function created by Ronald Rivest in 1992. From a secure hash function we want, 128-bit pre-image and secondary pre-image resistance, and 64-bit collision resistance. MD5 collision resistance is broken, and finding collision can be done in ...


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