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    <p>This question is very similar to <a href="https://stackoverflow.com/questions/938031/implementing-secure-unique-single-use-activation-urls-in-asp-net-c/938076#938076">Implementing secure, unique “single-use” activation URLs in ASP.NET (C#)</a>. </p> <p>My answer there is close to your scheme, with a few issues pointed out - such as short period of validity, handling double signups, etc.<br> Your use of a <strong>cryptographic</strong> nonce is also important, that many tend to skip over - e.g. "lets just use a GUID"... </p> <p>One new point that you do raise, and this is important here, is wrt the idempotency of GET.<br> Whilst I agree with your general intent, its clear that idempotency is in direct contradiction to one-time links, which is a necessity in some situations such as this. </p> <p>I would have liked to posit that this doesn't really violate the idempotentness of the GET, but unfortunately it does... On the other hand, the RFC says GET <strong>SHOULD</strong> be idempotent, its not a MUST. So I would say forgo it in this case, and stick to the one-time auto-invalidated links.</p> <p>If you <em>really</em> want to aim for strict RFC compliance, and not get into non-idempotent(?) GETs, you can have the GET page auto-submit the POST - kind of a loophole around that bit of the RFC, but legit, and you dont require the user to double-optin, and you're not bugging him...</p> <p>You dont really have to worry about preloading (are you talkng about CSRF, or browser-optimizers?)... CSRF is useless because of the nonce, and optimizers usually wont process javascript (used to auto-submit) on the preloaded page.</p>
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    1. POWhat are best practices for activation/registration/password-reset links in emails with nonce
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    1. COThank you, for the pointer AviD. Good solution to have javascript on the first page submit the POST. That does not bug the user and conforms to the RFC. I thought of the browser pre-loading a URL that is displayed in the body of a webmail client. This would definitely not execute javascript code at the target web page. This is a good proposal ... do you have any references where something like that is implemented?
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    2. CORight now, I could only think of references at some of my consulting clients (which I can't really disclose)... I don't really bother noticing other sites anymore... Sorry.
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