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https://issues.apache.org/jira/browse/SHIRO-441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13663257#comment-13663257
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Marian Seitner commented on SHIRO-441:
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I'd also contribute actual documentation updates but I think it's easier to 
have the documentation source available. Is it somewhere in the repo and I only 
didn't find it?
                
> Explain how "Remember Me" works under the hood and that you might want to use 
> a custom cipher key
> -------------------------------------------------------------------------------------------------
>
>                 Key: SHIRO-441
>                 URL: https://issues.apache.org/jira/browse/SHIRO-441
>             Project: Shiro
>          Issue Type: Documentation
>          Components: Documentation, Sample Apps
>    Affects Versions: 1.2.1
>            Reporter: Marian Seitner
>
> Neither the tutorial (http://shiro.apache.org/tutorial.html (section "Using 
> Shiro")) nor the the reference documentation 
> (http://shiro.apache.org/authentication.html#Authentication-Rememberedvs.Authenticated
>  (chapter "Authentication")) give any hints that without a custom cipher key 
> the - publicly available - default key will be used (defined in 
> http://grepcode.com/file/repo1.maven.org/maven2/com.ning/metrics.collector/1.2.1/org/apache/shiro/mgt/AbstractRememberMeManager.java/).
> Especially the statement in the tutorial is questionable: "this is all you 
> have to do to support 'remember me' (no config - built in!)". While true and 
> fairly obvious to advanced developers the potential security implications 
> should be better explained.

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