[liberationtech] FBI ECSU-DITU

[katana]

Hi,

during a web search for the FBI ECSU-DITU unit - the "switch" between
NSA and the cooperating providers, mentioned in the added WaPo slides -
i stumbled upon
<http://electrospaces.blogspot.ro/2013/07/new-insights-into-prism-program.html>,
where the author expresses his summary or interpretation of PRISM. From
there i got <http://cryptome.org/2012/08/fbi-spy-letf.pdf>, a summary of
a Law Enforcement Technical Forum meeting from 2010 with some indirect
informations about DITU.

Btw. regarding Skype: on p. 5, a Mr. Scott Sheets from Verizon Wireless
"provided the following detailed information:
# SIP Media Gateway (provided by Level 3 (NB: the same as in
<http://info.publicintelligence.net/US-NSAs/US-NSAs-Level3.pdf>?),
located in Atlanta, is used when Skype related call is dialed. The SIP
Media Gatewat converts the skype call to VoIP,
# Data Channel - skype encrypts it using a propriatary algorithm.
However, at the request of Verizon, decrypting mechanisms were provided,"

But, has anybody more informations about ECSU-DITU?

-- 
Katana