Another use case: validating documents received

As part of another activity, the requirement came up to allow the 
javascript in a browser to validate the whether an HTML document that 
had been received was actually the original document sent by the web 
server or whether it had been modified in transit (e.g. by some 
'helpful' party that was doing ad insertion). Note that retreiving the 
document over TLS doesn't provide that guarantee due to the presence of 
TLS proxies.

It isn't quite clear to me how to solve this problem, but it seems like 
a useful use case.

Philip

-- 
Philip Gladstone
Distinguished Engineer
Product Development
pgladstone@cisco.com
Phone: +1 978-ZEN-TOAD (+1 978 936 8623)
Google: +1 978 800 1010
Ham radio: N1DQ