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No. The wikipedia article is in my honest opinion misrepresenting this article on a reduced round attack on the SHA-2 family of hashes. Although these attacks improve upon the existing reduced round SHA-2 attacks, they do not threaten the security of the full SHA-2 family. In other words, no collisions have been found in any of the SHA-2 hashes. The ...

Base64 provides a 1:1 transform from input to output (and back again if desired). So if you take a set of unique items and base64 encode all of them they will all be unique. So the question becomes if you run a GUID through SHA1, will the resulting hash have the same uniqueness as the GUID? The answer is practically - yes; theoretically not quite. Multiple ...

GUIDs are not guaranteed to be unique. GUIDs are Microsoft's take on UUIDs. Collisions can occur, depending on which type of GUID generator is used. (Though collisions are extremely rare in all cases.) GUIDs as they are defined have a size of 128 bits. SHA1 is a cryptographic hash function with an output size of 160 bits, larger than the GUID size, and SHA1 ...