For those too lazy to look it up here's some speculation from
   Greenwald's IAMA October 31 2013.
   [1]https://www.reddit.com/r/IAmA/comments/1nisdy/were_glenn_greenwald_a
   nd_janine_gibson_of_the/ccj4rvw
   Again, plain text and html:
   While I do not know the name redacted in that report, the "VPN and Web
   encryption devices" mentioned are most likely [2]hardware SSL
   acceleration appliances[1] , and due to the sensitive nature of the
   backdoor being discussed, are probably in chips fabricated by a
   US-based silicon designer using a US-located silicon fabrication plant.

   The reason for that is twofold; first, you don't want a foreign power
   discovering your backdoor in a chip, and second, you don't want a
   foreign power inserting their own backdoor.

   The [3]vendors[2] list in Wikipedia lists the following vendors of SSL
   appliances:
     * Barracuda Networks
     * Array Networks
     * CAI Networks
     * Cavium Networks (fabless semiconductor designer)
     * Cisco Systems
     * Citrix Systems
     * Cotendo
     * Coyote point systems
     * Crescendo Networks
     * Exinda
     * F5 Networks
     * Foundry Networks
     * Forum Systems
     * Freescale Semiconductor (fabless and fab-owning)
     * Hifn
     * IBM (fab-owning)
     * Interface Masters Technologies
     * jetNEXUS
     * Juniper Networks
     * Nortel Networks
     * Radware
     * Riverbed Technology
     * Strangeloop Networks
     * Sun Microsystems

   Of those, the two names that stand out most are IBM (which is no
   stranger to crippling encryption upon the demands of the NSA, with
   fabrication plants throughout the world and the United States, but
   which isn't significantly given to florid chip descriptors) and
   Freescale Semiconductors - it is itself a large semiconductor
   fabricator, focused on semiconductor fabrication, with foundries in
   Chandler, AZ and Oak Hill, TX.

   One not mentioned in that list is Broadcom, a semiconductor
   manufacturer that is fabless, that is - it doesn't own any fabrication
   capability, itself. It does, however, design a very large percentage of
   communications chips used in the industry. Not finding a Broadcom chip
   somewhere in a device is notable.

   The redacted space is roughly twelve all-caps letters or sixteen
   mixed-case letters in that font. If we could have someone identify
   exactly which font was used, then we could experiment with chip names
   from SSL acceleration device manifests, in that font, and see which fit
   into the redacted space, possibly with the manufacturer's name in front
   of the chip - for example, the [4]Freescale SAHARA[3] appears to fit
   nicely - and is touted as having configurable access control to the
   random number generator and hashing functions on that feature sheet
   linked - but is just one possibility. Another is the
   [5]PowerArchitecture™ from Mocana -formerly FreeScale[4] .

   If I were in the position to lead a project to reverse-engineer the
   possible name of the chip, I would:
     * Find out what the top five top-selling SSL acceleration device
       manufacturers in the world are;
     * get a list of their best-selling products;
     * Get parts manifests for each of their popular products, possibly
       from an electronics tear down research organisation;
     * Locate and name the crypto accelerator chips;
     * Determine who designed and fabricated those chips.
     * Get the name of the font used in the report in the imgur link;
     * Compose the name of each of those chips in that font at that pitch;
     * Do a little comparing.

   Edit: OP is assuming that the report is listing two, separate chips.
   While that is possible, it is equally as likely that one variety or
   species of chip is being named! i.e. Intel Pentium chips. There is also
   no guarantee that the redacted text lists a florid, marketing-friendly
   name, and may possibly be a code name internal to the US intelligence
   community. These and other alternatives should not be discounted.

References

   1. https://www.reddit.com/r/IAmA/comments/1nisdy/were_glenn_greenwald_and_janine_gibson_of_the/ccj4rvw
   2. http://en.wikipedia.org/wiki/SSL_acceleration
   3. http://en.wikipedia.org/wiki/SSL_acceleration#Vendors
   4. http://www.freescale.com/webapp/sps/site/overview.jsp?code=NETWORK_SECURITY_CRYPTOG
   5. https://mocana.com/partnerprog/freescale/selling_freescale_sca.pdf