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So what you need is a fast cryptgraphically secure hash function? There are some. If you're in hardware Keccak might be an option as it uses many bit-permutations. If you're in software there are Skein and Blake2b/s/bp/sp. Skein was the fastest hash-function of the SHA-3 competition and Blake2 is the successor to BLAKE, the second fastest hash-function in ...


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Of course all the above comments are valid (rogue certificates, fake-websites, ...), but here's another story: Let's assume you to buy, let's say a house. You are lazy and want to sign the contract digitally. The person, selling you the house presents you with a valid certificate and even is so nice to sign the contract you're going to sign. Now you sign ...


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The actual data can be omitted from a SignedData encapContentInfo; see current CMS RFC which is not materially changed from earlier versions. The RFC calls this "external signature"; IME it is also called "detached signature" or "clear-sign[ing,ed]", and is widely used. For example S/MIME signed messages usually are a multipart containing the plaintext data ...



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