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Message: [QUOTE="Arne Vajhøj, post: 5050493"] Yes and no. A cryptographic secure RNG is really just an RNG that produces values that are hard/impossible to predict. It has an obvious usage for generating cryptography keys. But it also has other usages. Hard to guess id's are one of the other. It solves the problem it is intended to solve. The purpose of a confirmation email with a link with such an id is to verify that the owner of the email account is indeed the one registering. You can not ensure that if it is possible for the registering person to guess the id. It need to be hard to guess. Which is what a cryptographic secure RNG provide. That is not relevant for what we are discussing. We are discussing how to send out confirmation emails with links. Whether that idea brings value or not is another question. Arne [/QUOTE]