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Message: [QUOTE="Magnus Warker, post: 5050384"] Hi, I want users to register on a site and send confirmation emails to them. These emails should contain a link like this: [URL]http://myurl?registration=E4AC4BD4[/URL] Here, "E4AC4BD4" should be a unique string. My idea for such a string is just to hash an integer, i. e. the internal database key for the registration record. However, I actually don't know how to get such a hash. I tried BCrypt, but this produces hashes built out of characters that I would not want to be in a URL, e. g. commatas and that. I would like to have a string like this: - hexadecimal only - fixed size, e. g. always n characters, independend of the integer Can you help? Thank you! Magnus [/QUOTE]