The Ruby on Rails Security Guide 
http://guides.rubyonrails.org/security.html has a 
fairly embarrassing anachronism in it.  In section 2.2 on Session ids it 
reads 

To date MD5 is uncompromised, but there have been collisions, so it is 
> theoretically possible to create another input text with the same hash 
> value.
>

Security experts know that MD5 is at this point deeply flawed and 
untrustworthy for any cryptographic purpose.  While I believe this 
reassurance in the guide was true as of the time of writing, it is now 
several years out of date and simply incorrect.

Fortunately, rails no longer actually relies on MD5 for session ids, I 
believe since this 
commit<https://github.com/rails/rails/commit/b3411ff59eb1e1c31f98f58f117a2ffaaf0c3ff5#diff-4>in
 2008.

I have tried a couple of times to contact Heiko Webers, at 42 {_et_} 
rorsecurity.info, requesting that he update the document.  But I have 
gotten zero response from him since I first tried over 6 months ago.  Can 
somebody please step up and update this document to reflect the current 
reality?  I'd also recommend changing the note at the top about who is the 
current maintainer of this document.

Cheers,
Leo

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