The TokenAuthenticatable strategy has been removed from Devise because it's vulnerable to timing attacks. As a consequence, the examples in this page are out of date.
See this gist by José Valim and some popular alternatives below.
ExamplesNote: these examples are out of date.
Here is a blog post with some quick code snippets and a link to a quick example app on github. https://web.archive.org/web/20120712095509/http://zyphdesignco.com/blog/simple-auth-token-example-with-devise
And here is another blog post with a detailed example: http://matteomelani.wordpress.com/2011/10/17/authentication-for-mobile-devices/
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